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Update output for Julia 1.0
This commit is contained in:
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@ -89,7 +89,9 @@ false
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# Strings are UTF8 encoded. Only if they contain only ASCII characters can
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# they be safely indexed.
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ascii("This is a string")[1] # => 'T' # Julia indexes from 1
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ascii("This is a string")[1]
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# => 'T': ASCII/Unicode U+0054 (category Lu: Letter, uppercase)
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# Julia indexes from 1
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# Otherwise, iterating over strings is recommended (map, for loops, etc).
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# $ can be used for string interpolation:
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@ -101,7 +103,7 @@ using Printf
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@printf "%d is less than %f\n" 4.5 5.3 # => 5 is less than 5.300000
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# Printing is easy
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println("I'm Julia. Nice to meet you!")
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println("I'm Julia. Nice to meet you!") # => I'm Julia. Nice to meet you!
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# String can be compared lexicographically
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"good" > "bye" # => true
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@ -147,19 +149,18 @@ SomeOtherVar123! = 6 # => 6
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# functions are sometimes called mutating functions or in-place functions.
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# Arrays store a sequence of values indexed by integers 1 through n:
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a = Int64[] # => 0-element Int64 Array
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a = Int64[] # => 0-element Array{Int64,1}
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# 1-dimensional array literals can be written with comma-separated values.
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b = [4, 5, 6] # => 3-element Int64 Array: [4, 5, 6]
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b = [4; 5; 6] # => 3-element Int64 Array: [4, 5, 6]
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b[1] # => 4
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b = [4, 5, 6] # => 3-element Array{Int64,1}: [4, 5, 6]
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b = [4; 5; 6] # => 3-element Array{Int64,1}: [4, 5, 6]
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b[end] # => 6
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# 2-dimensional arrays use space-separated values and semicolon-separated rows.
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matrix = [1 2; 3 4] # => 2x2 Int64 Array: [1 2; 3 4]
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matrix = [1 2; 3 4] # => 2×2 Array{Int64,2}: [1 2; 3 4]
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# Arrays of a particular type
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b = Int8[4, 5, 6] # => 3-element Int8 Array: [4, 5, 6]
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b = Int8[4, 5, 6] # => 3-element Array{Int8,1}: [4, 5, 6]
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# Add stuff to the end of a list with push! and append!
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push!(a, 1) # => [1]
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@ -186,16 +187,28 @@ pushfirst!(a, 7) # => [7,2,4,3,4,5,6]
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# Function names that end in exclamations points indicate that they modify
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# their argument.
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arr = [5,4,6] # => 3-element Int64 Array: [5,4,6]
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sort(arr) # => [4,5,6]; arr is still [5,4,6]
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sort!(arr) # => [4,5,6]; arr is now [4,5,6]
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arr = [5,4,6] # => 3-element Array{Int64,1}: [5,4,6]
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# Looking out of bounds is a BoundsError
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try
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a[0]
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# => BoundsError: attempt to access 7-element Array{Int64,1} at index [0]
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a[end + 1]
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# => BoundsError: attempt to access 7-element Array{Int64,1} at index [8]
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a[0]
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# => ERROR: BoundsError: attempt to access 7-element Array{Int64,1} at
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# index [0]
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# => Stacktrace:
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# => [1] getindex(::Array{Int64,1}, ::Int64) at .\array.jl:731
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# => [2] top-level scope at none:0
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# => [3] ...
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# => in expression starting at ...\LearnJulia.jl:180
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a[end + 1]
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# => ERROR: BoundsError: attempt to access 7-element Array{Int64,1} at
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# index [8]
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# => Stacktrace:
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# => [1] getindex(::Array{Int64,1}, ::Int64) at .\array.jl:731
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# => [2] top-level scope at none:0
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# => [3] ...
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# => in expression starting at ...\LearnJulia.jl:188
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catch e
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println(e)
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end
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@ -205,7 +218,8 @@ end
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# find these files.
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# You can initialize arrays from ranges
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a = [1:5;] # => 5-element Int64 Array: [1,2,3,4,5]
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a = [1:5;] # => 5-element Array{Int64,1}: [1,2,3,4,5]
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a2 = [1:5] # => 1-element Array{UnitRange{Int64},1}: [1:5]
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# You can look at ranges with slice syntax.
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a[1:3] # => [1, 2, 3]
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@ -229,7 +243,9 @@ length(a) # => 8
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tup = (1, 2, 3) # => (1,2,3) # an (Int64,Int64,Int64) tuple.
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tup[1] # => 1
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try
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tup[1] = 3 # => ERROR: no method setindex!((Int64,Int64,Int64),Int64,Int64)
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tup[1] = 3
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# => ERROR: MethodError: no method matching
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# setindex!(::Tuple{Int64,Int64,Int64}, ::Int64, ::Int64)
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catch e
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println(e)
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end
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@ -254,11 +270,12 @@ e, d = d, e # => (5,4) # d is now 5 and e is now 4
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# Dictionaries store mappings
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empty_dict = Dict() # => Dict{Any,Any}()
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empty_dict = Dict() # => Dict{Any,Any} with 0 entries
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# You can create a dictionary using a literal
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filled_dict = Dict("one" => 1, "two" => 2, "three" => 3)
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# => Dict{String,Int64}
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# => Dict{String,Int64} with 3 entries:
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# => "two" => 2, "one" => 1, "three" => 3
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# Look up values with []
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filled_dict["one"] # => 1
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@ -266,12 +283,13 @@ filled_dict["one"] # => 1
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# Get all keys
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keys(filled_dict)
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# => Base.KeySet for a Dict{String,Int64} with 3 entries. Keys:
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# "two", "one", "three"
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# => "two", "one", "three"
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# Note - dictionary keys are not sorted or in the order you inserted them.
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# Get all values
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values(filled_dict)
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# => Base.ValueIterator{Dict{String,Int64}} with 3 entries. Values: 2, 1, 3
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# => Base.ValueIterator for a Dict{String,Int64} with 3 entries. Values:
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# => 2, 1, 3
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# Note - Same as above regarding key ordering.
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# Check for existence of keys in a dictionary with in, haskey
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@ -282,7 +300,7 @@ haskey(filled_dict, 1) # => false
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# Trying to look up a non-existent key will raise an error
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try
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filled_dict["four"] # => KeyError: key "four" not found
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filled_dict["four"] # => ERROR: KeyError: key "four" not found
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catch e
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println(e)
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end
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@ -293,7 +311,7 @@ get(filled_dict, "one", 4) # => 1
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get(filled_dict, "four", 4) # => 4
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# Use Sets to represent collections of unordered, unique values
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empty_set = Set() # => Set{Any}()
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empty_set = Set() # => Set(Any[])
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# Initialize a set with values
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filled_set = Set([1, 2, 2, 3, 4]) # => Set([4, 2, 3, 1])
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@ -353,18 +371,16 @@ for pair in Dict("dog" => "mammal", "cat" => "mammal", "mouse" => "mammal")
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from, to = pair
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println("$from is a $to")
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end
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# prints:
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# dog is a mammal
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# cat is a mammal
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# mouse is a mammal
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# => mouse is a mammal
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# => cat is a mammal
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# => dog is a mammal
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for (k, v) in Dict("dog" => "mammal", "cat" => "mammal", "mouse" => "mammal")
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println("$k is a $v")
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end
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# prints:
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# dog is a mammal
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# cat is a mammal
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# mouse is a mammal
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# => mouse is a mammal
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# => cat is a mammal
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# => dog is a mammal
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# While loops loop while a condition is true
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let x = 0
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@ -406,11 +422,11 @@ end
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add(5, 6) # => 11 after printing out "x is 5 and y is 6"
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# Compact assignment of functions
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f_add(x, y) = x + y # => "f (generic function with 1 method)"
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f_add(x, y) = x + y # => f_add (generic function with 1 method)
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f_add(3, 4) # => 7
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# Function can also return multiple values as tuple
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fn(x, y) = x + y, x - y
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fn(x, y) = x + y, x - y # => fn (generic function with 1 method)
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fn(3, 4) # => (7, -1)
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# You can define functions that take a variable number of
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@ -437,13 +453,14 @@ add(x...) # this is equivalent to add(5,6)
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function defaults(a, b, x=5, y=6)
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return "$a $b and $x $y"
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end
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# => defaults (generic function with 3 methods)
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defaults('h', 'g') # => "h g and 5 6"
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defaults('h', 'g', 'j') # => "h g and j 6"
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defaults('h', 'g', 'j', 'k') # => "h g and j k"
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try
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defaults('h') # => ERROR: no method defaults(Char,)
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defaults() # => ERROR: no methods defaults()
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defaults('h') # => ERROR: MethodError: no method matching defaults(::Char)
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defaults() # => ERROR: MethodError: no method matching defaults()
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catch e
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println(e)
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end
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@ -452,10 +469,11 @@ end
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function keyword_args(;k1=4, name2="hello") # note the ;
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return Dict("k1" => k1, "name2" => name2)
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end
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# => keyword_args (generic function with 1 method)
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keyword_args(name2="ness") # => ["name2"=>"ness","k1"=>4]
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keyword_args(k1="mine") # => ["k1"=>"mine","name2"=>"hello"]
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keyword_args() # => ["name2"=>"hello","k1"=>4]
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keyword_args(name2="ness") # => ["name2"=>"ness", "k1"=>4]
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keyword_args(k1="mine") # => ["name2"=>"hello", "k1"=>"mine"]
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keyword_args() # => ["name2"=>"hello", "k1"=>4]
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# You can combine all kinds of arguments in the same function
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function all_the_args(normal_arg, optional_positional_arg=2; keyword_arg="foo")
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@ -463,6 +481,7 @@ function all_the_args(normal_arg, optional_positional_arg=2; keyword_arg="foo")
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println("optional arg: $optional_positional_arg")
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println("keyword arg: $keyword_arg")
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end
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# => all_the_args (generic function with 2 methods)
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all_the_args(1, 3, keyword_arg=4)
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# prints:
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@ -477,6 +496,7 @@ function create_adder(x)
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end
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return adder
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end
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# => create_adder (generic function with 1 method)
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# This is "stabby lambda syntax" for creating anonymous functions
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(x -> x > 2)(3) # => true
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@ -485,6 +505,7 @@ end
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function create_adder(x)
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y -> x + y
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end
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# => create_adder (generic function with 1 method)
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# You can also name the internal function, if you want
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function create_adder(x)
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@ -493,9 +514,11 @@ function create_adder(x)
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end
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adder
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end
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# => create_adder (generic function with 1 method)
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add_10 = create_adder(10)
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add_10(3) # => 13
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add_10 = create_adder(10) # => (::getfield(Main, Symbol("#adder#11")){Int64})
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# (generic function with 1 method)
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add_10(3) # => 13
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# There are built-in higher order functions
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@ -555,16 +578,16 @@ abstract type Cat end # just a name and point in the type hierarchy
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using InteractiveUtils # defines the subtype and supertype function
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# For example, Number is an abstract type
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subtypes(Number) # => 2-element Array{Any,1}:
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# Complex{T<:Real}
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# Real
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# => Complex
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# => Real
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subtypes(Cat) # => 0-element Array{Any,1}
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# AbstractString, as the name implies, is also an abstract type
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subtypes(AbstractString) # 4-element Array{Any,1}:
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# String
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# SubString
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# SubstitutionString
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# Test.GenericString
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subtypes(AbstractString) # => 4-element Array{Any,1}:
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# => String
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# => SubString
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# => SubstitutionString
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# => Test.GenericString
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# Every type has a super type; use the `supertype` function to get it.
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typeof(5) # => Int64
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@ -626,7 +649,7 @@ function meow(animal::Tiger)
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end
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# Testing the meow function
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meow(tigger) # => "rawwr"
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meow(tigger) # => "rawwwr"
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meow(Lion("brown", "ROAAR")) # => "ROAAR"
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meow(Panther()) # => "grrr"
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@ -639,10 +662,11 @@ Panther <: Cat # => true
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function pet_cat(cat::Cat)
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println("The cat says $(meow(cat))")
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end
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# => pet_cat (generic function with 1 method)
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pet_cat(Lion("42")) # => prints "The cat says 42"
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pet_cat(Lion("42")) # => The cat says 42
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try
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pet_cat(tigger) # => ERROR: no method pet_cat(Tiger,)
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pet_cat(tigger) # => ERROR: MethodError: no method matching pet_cat(::Tiger)
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catch e
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println(e)
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end
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@ -657,45 +681,54 @@ function fight(t::Tiger, c::Cat)
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end
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# => fight (generic function with 1 method)
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fight(tigger, Panther()) # => prints The orange tiger wins!
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fight(tigger, Lion("ROAR")) # => prints The orange tiger wins!
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fight(tigger, Panther()) # => The orange tiger wins!
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fight(tigger, Lion("ROAR")) # => The orange tiger wins!
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# Let's change the behavior when the Cat is specifically a Lion
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fight(t::Tiger, l::Lion) = println("The $(l.mane_color)-maned lion wins!")
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# => fight (generic function with 2 methods)
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fight(tigger, Panther()) # => prints The orange tiger wins!
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fight(tigger, Lion("ROAR")) # => prints The green-maned lion wins!
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fight(tigger, Panther()) # => The orange tiger wins!
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fight(tigger, Lion("ROAR")) # => The green-maned lion wins!
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# We don't need a Tiger in order to fight
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fight(l::Lion, c::Cat) = println("The victorious cat says $(meow(c))")
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# => fight (generic function with 3 methods)
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fight(Lion("balooga!"), Panther()) # => prints The victorious cat says grrr
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fight(Lion("balooga!"), Panther()) # => The victorious cat says grrr
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try
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fight(Panther(), Lion("RAWR"))
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fight(Panther(), Lion("RAWR"))
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# => ERROR: MethodError: no method matching fight(::Panther, ::Lion)
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# => Closest candidates are:
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# => fight(::Tiger, ::Lion) at ...
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# => fight(::Tiger, ::Cat) at ...
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# => fight(::Lion, ::Cat) at ...
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# => ...
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catch e
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println(e)
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# => MethodError(fight, (Panther("green"), Lion("green", "RAWR")),
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# 0x000000000000557b)
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end
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# Also let the cat go first
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fight(c::Cat, l::Lion) = println("The cat beats the Lion")
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# => fight (generic function with 4 methods)
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# This warning is because it's unclear which fight will be called in:
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try
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fight(Lion("RAR"), Lion("brown", "rarrr"))
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# => prints The victorious cat says rarrr
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# => ERROR: MethodError: fight(::Lion, ::Lion) is ambiguous. Candidates:
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# => fight(c::Cat, l::Lion) in Main at ...
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# => fight(l::Lion, c::Cat) in Main at ...
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# => Possible fix, define
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# => fight(::Lion, ::Lion)
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# => ...
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catch e
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println(e)
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# => MethodError(fight, (Lion("green", "RAR"), Lion("brown", "rarrr")),
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# 0x000000000000557c)
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end
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# The result may be different in other versions of Julia
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fight(l::Lion, l2::Lion) = println("The lions come to a tie")
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fight(Lion("RAR"), Lion("brown", "rarrr")) # => prints The lions come to a tie
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fight(l::Lion, l2::Lion) = println("The lions come to a tie")
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# => fight (generic function with 5 methods)
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fight(Lion("RAR"), Lion("brown", "rarrr")) # => The lions come to a tie
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# Under the hood
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@ -706,74 +739,112 @@ square_area(l) = l * l # square_area (generic function with 1 method)
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square_area(5) # => 25
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# What happens when we feed square_area an integer?
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code_native(square_area, (Int32,))
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1 # Prologue
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# push RBP
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# mov RBP, RSP
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# Source line: 1
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# movsxd RAX, EDI # Fetch l from memory?
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# imul RAX, RAX # Square l and store the result in RAX
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# pop RBP # Restore old base pointer
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# ret # Result will still be in RAX
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code_native(square_area, (Int32,), syntax = :intel)
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# .text
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# ; Function square_area {
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# ; Location: REPL[116]:1 # Prologue
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# push rbp
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# mov rbp, rsp
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# ; Function *; {
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# ; Location: int.jl:54
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# imul ecx, ecx # Square l and store the result in ECX
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# ;}
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# mov eax, ecx
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# pop rbp # Restore old base pointer
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# ret # Result will still be in EAX
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# nop dword ptr [rax + rax]
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# ;}
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code_native(square_area, (Float32,))
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1
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# push RBP
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# mov RBP, RSP
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# Source line: 1
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||||
# vmulss XMM0, XMM0, XMM0 # Scalar single precision multiply (AVX)
|
||||
# pop RBP
|
||||
# ret
|
||||
code_native(square_area, (Float32,), syntax = :intel)
|
||||
# .text
|
||||
# ; Function square_area {
|
||||
# ; Location: REPL[116]:1
|
||||
# push rbp
|
||||
# mov rbp, rsp
|
||||
# ; Function *; {
|
||||
# ; Location: float.jl:398
|
||||
# vmulss xmm0, xmm0, xmm0 # Scalar single precision multiply (AVX)
|
||||
# ;}
|
||||
# pop rbp
|
||||
# ret
|
||||
# nop word ptr [rax + rax]
|
||||
# ;}
|
||||
|
||||
code_native(square_area, (Float64,), syntax = :intel)
|
||||
# .text
|
||||
# ; Function square_area {
|
||||
# ; Location: REPL[116]:1
|
||||
# push rbp
|
||||
# mov rbp, rsp
|
||||
# ; Function *; {
|
||||
# ; Location: float.jl:399
|
||||
# vmulsd xmm0, xmm0, xmm0 # Scalar double precision multiply (AVX)
|
||||
# ;}
|
||||
# pop rbp
|
||||
# ret
|
||||
# nop word ptr [rax + rax]
|
||||
# ;}
|
||||
|
||||
code_native(square_area, (Float64,))
|
||||
# .section __TEXT,__text,regular,pure_instructions
|
||||
# Filename: none
|
||||
# Source line: 1
|
||||
# push RBP
|
||||
# mov RBP, RSP
|
||||
# Source line: 1
|
||||
# vmulsd XMM0, XMM0, XMM0 # Scalar double precision multiply (AVX)
|
||||
# pop RBP
|
||||
# ret
|
||||
#
|
||||
# Note that julia will use floating point instructions if any of the
|
||||
# arguments are floats.
|
||||
# Let's calculate the area of a circle
|
||||
circle_area(r) = pi * r * r # circle_area (generic function with 1 method)
|
||||
circle_area(5) # 78.53981633974483
|
||||
|
||||
code_native(circle_area, (Int32,))
|
||||
# .section __TEXT,__text,regular,pure_instructions
|
||||
# Filename: none
|
||||
# Source line: 1
|
||||
# push RBP
|
||||
# mov RBP, RSP
|
||||
# Source line: 1
|
||||
# vcvtsi2sd XMM0, XMM0, EDI # Load integer (r) from memory
|
||||
# movabs RAX, 4593140240 # Load pi
|
||||
# vmulsd XMM1, XMM0, QWORD PTR [RAX] # pi * r
|
||||
# vmulsd XMM0, XMM0, XMM1 # (pi * r) * r
|
||||
# pop RBP
|
||||
# ret
|
||||
#
|
||||
code_native(circle_area, (Int32,), syntax = :intel)
|
||||
# .text
|
||||
# ; Function circle_area {
|
||||
# ; Location: REPL[121]:1
|
||||
# push rbp
|
||||
# mov rbp, rsp
|
||||
# ; Function *; {
|
||||
# ; Location: operators.jl:502
|
||||
# ; Function *; {
|
||||
# ; Location: promotion.jl:314
|
||||
# ; Function promote; {
|
||||
# ; Location: promotion.jl:284
|
||||
# ; Function _promote; {
|
||||
# ; Location: promotion.jl:261
|
||||
# ; Function convert; {
|
||||
# ; Location: number.jl:7
|
||||
# ; Function Type; {
|
||||
# ; Location: float.jl:60
|
||||
# vcvtsi2sd xmm0, xmm0, ecx # Load integer (r) from memory
|
||||
# movabs rax, 497710928 # Load pi
|
||||
# ;}}}}}
|
||||
# ; Function *; {
|
||||
# ; Location: float.jl:399
|
||||
# vmulsd xmm1, xmm0, qword ptr [rax] # pi * r
|
||||
# vmulsd xmm0, xmm1, xmm0 # (pi * r) * r
|
||||
# ;}}
|
||||
# pop rbp
|
||||
# ret
|
||||
# nop dword ptr [rax]
|
||||
# ;}
|
||||
|
||||
code_native(circle_area, (Float64,))
|
||||
# .section __TEXT,__text,regular,pure_instructions
|
||||
# Filename: none
|
||||
# Source line: 1
|
||||
# push RBP
|
||||
# mov RBP, RSP
|
||||
# movabs RAX, 4593140496
|
||||
# Source line: 1
|
||||
# vmulsd XMM1, XMM0, QWORD PTR [RAX]
|
||||
# vmulsd XMM0, XMM1, XMM0
|
||||
# pop RBP
|
||||
# ret
|
||||
#
|
||||
code_native(circle_area, (Float64,), syntax = :intel)
|
||||
# .text
|
||||
# ; Function circle_area {
|
||||
# ; Location: REPL[121]:1
|
||||
# push rbp
|
||||
# mov rbp, rsp
|
||||
# movabs rax, 497711048
|
||||
# ; Function *; {
|
||||
# ; Location: operators.jl:502
|
||||
# ; Function *; {
|
||||
# ; Location: promotion.jl:314
|
||||
# ; Function *; {
|
||||
# ; Location: float.jl:399
|
||||
# vmulsd xmm1, xmm0, qword ptr [rax]
|
||||
# ;}}}
|
||||
# ; Function *; {
|
||||
# ; Location: float.jl:399
|
||||
# vmulsd xmm0, xmm1, xmm0
|
||||
# ;}
|
||||
# pop rbp
|
||||
# ret
|
||||
# nop dword ptr [rax + rax]
|
||||
# ;}
|
||||
```
|
||||
|
||||
## Further Reading
|
||||
|
||||
Loading…
Reference in New Issue
Block a user