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Merge pull request #848 from biobonnie/master

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Added a few clarifying lines to Scala.
This commit is contained in:
ven 2014-11-07 08:12:43 +01:00
commit 158f996f6d
1 changed files with 11 additions and 4 deletions
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15
scala.html.markdown
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@ -189,6 +189,8 @@ sSquared.reduce (_+_)
// The filter function takes a predicate (a function from A -> Boolean) and // The filter function takes a predicate (a function from A -> Boolean) and
// selects all elements which satisfy the predicate // selects all elements which satisfy the predicate
List(1, 2, 3) filter (_ > 2) // List(3) List(1, 2, 3) filter (_ > 2) // List(3)
case class Person(name: String, age: Int)
List( List(
Person(name = "Dom", age = 23), Person(name = "Dom", age = 23),
Person(name = "Bob", age = 30) Person(name = "Bob", age = 30)
@ -197,6 +199,7 @@ List(
// Scala a foreach method defined on certain collections that takes a type // Scala a foreach method defined on certain collections that takes a type
// returning Unit (a void method) // returning Unit (a void method)
val aListOfNumbers = Set(1,2,3,45,234)
aListOfNumbers foreach (x => println(x)) aListOfNumbers foreach (x => println(x))
aListOfNumbers foreach println aListOfNumbers foreach println
@ -255,6 +258,7 @@ def showNumbersInRange(a:Int, b:Int):Unit = {
if (a < b) if (a < b)
showNumbersInRange(a + 1, b) showNumbersInRange(a + 1, b)
} }
showNumbersInRange(1,14)
@ -270,15 +274,13 @@ if (x == 11) println ("yeah") else println("nay")
println(if (x == 10) "yeah" else "nope") println(if (x == 10) "yeah" else "nope")
val text = if (x == 10) "yeah" else "nope" val text = if (x == 10) "yeah" else "nope"
var i = 0
while (i < 10) { println("i " + i); i+=1 }
// Object oriented features // Object oriented features
// Classname is Dog // Classname is Dog
class Dog { class Dog(br: String) {
var breed: String = br
//A method called bark, returning a String //A method called bark, returning a String
def bark: String = { def bark: String = {
// the body of the method // the body of the method
@ -286,6 +288,11 @@ class Dog {
} }
} }
val mydog = new Dog("greyhound")
println(mydog.breed) // => "greyhound"
println(mydog.bark) // => "Woof, woof!"
// Classes can contain nearly any other construct, including other classes, // Classes can contain nearly any other construct, including other classes,
// functions, methods, objects, case classes, traits etc. // functions, methods, objects, case classes, traits etc.