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edited tuples section

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Leah Hanson 2013-07-01 16:21:56 -04:00
parent 2995cd1005
commit 18c413f6f5
1 changed files with 13 additions and 18 deletions
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@ -109,7 +109,6 @@ Some!Other1Var! = 6 #=> 6 # You can use uppercase letters, digits, and exclamati
# * Names of functions and macros are in lower case, without underscores. # * Names of functions and macros are in lower case, without underscores.
# * Functions that modify their inputs have names that end in !. These functions are sometimes called mutating functions or in-place functions. # * Functions that modify their inputs have names that end in !. These functions are sometimes called mutating functions or in-place functions.
# Arrays store sequences # Arrays store sequences
li = Int64[] #=> 0-element Int64 Array li = Int64[] #=> 0-element Int64 Array
# 1-dimensional array literals can be written with comma-separated values. # 1-dimensional array literals can be written with comma-separated values.
@ -128,8 +127,8 @@ pop!(other_li) #=> 6 and other_li is now [4,5]
# Let's put it back # Let's put it back
push!(other_li,6) # other_li is now [4,5,6] again. push!(other_li,6) # other_li is now [4,5,6] again.
# Remember that Julia indexes from 1, not 0! li[1] #=> 1 # remember that Julia indexes from 1, not 0!
li[1] #=> 1 li[end] #=> 6 # end is a shorthand for the last index; it can be used in any indexing expression.
# Function names that end in exclamations points indicate that they modify their argument. # Function names that end in exclamations points indicate that they modify their argument.
arr = [5,4,6] #=> 3-element Int64 Array: [5,4,6] arr = [5,4,6] #=> 3-element Int64 Array: [5,4,6]
@ -162,26 +161,22 @@ contains(li,1) #=> true
# Examine the length with length # Examine the length with length
length(li) #=> 7 length(li) #=> 7
# Tuples are like lists but are immutable. # Tuples are immutable.
tup = (1, 2, 3) tup = (1, 2, 3) #=>(1,2,3) # an (Int64,Int64,Int64) tuple.
tup[0] #=> 1 tup[1] #=> 1
try: tup[0] = 3 # ERROR: no method setindex!((Int64,Int64,Int64),Int64,Int64)
tup[0] = 3 # Raises a TypeError
except TypeError:
print "Tuples cannot be mutated."
# You can do all those list thingies on tuples too # Many list functions also work on tuples
len(tup) #=> 3 length(tup) #=> 3
tup + (4, 5, 6) #=> (1, 2, 3, 4, 5, 6) tup[1:2] #=> (1,2)
tup[:2] #=> (1, 2) contains(tup,2) #=> true
2 in tup #=> True
# You can unpack tuples into variables # You can unpack tuples into variables
a, b, c = (1, 2, 3) # a is now 1, b is now 2 and c is now 3 a, b, c = (1, 2, 3) #=> (1,2,3) # a is now 1, b is now 2 and c is now 3
# Tuples are created by default if you leave out the parentheses # Tuples are created by default if you leave out the parentheses
d, e, f = 4, 5, 6 d, e, f = 4, 5, 6 #=> (4,5,6)
# Now look how easy it is to swap two values # Now look how easy it is to swap two values
e, d = d, e # d is now 5 and e is now 4 e, d = d, e #=> (5,4) # d is now 5 and e is now 4
# Dictionaries store mappings # Dictionaries store mappings