1
0
mirror of https://github.com/adambard/learnxinyminutes-docs.git synced 2025-08-18 04:21:25 +02:00
This commit is contained in:
Geoff Liu
2014-11-11 17:42:28 -08:00
7 changed files with 46 additions and 25 deletions

View File

@@ -100,7 +100,7 @@ true == false // false
"Scala strings are surrounded by double quotes"
'a' // A Scala Char
'Single quote strings don't exist' // Error
// 'Single quote strings don't exist' <= This causes an error
// Strings have the usual Java methods defined on them
"hello world".length
@@ -204,6 +204,7 @@ def showNumbersInRange(a:Int, b:Int):Unit = {
if (a < b)
showNumbersInRange(a + 1, b)
}
showNumbersInRange(1,14)
// Conditionals
@@ -218,9 +219,6 @@ if (x == 11) println ("yeah") else println("nay")
println(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 }
#################################################
## 4. Data Structures
@@ -292,7 +290,8 @@ d._2
And now we will explain what these are.
*/
class Dog {
class Dog(br: String) {
var breed: String = br
//A method called bark, returning a String
def bark: String = {
// the body of the method
@@ -300,6 +299,11 @@ 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,
// functions, methods, objects, case classes, traits etc.
@@ -388,6 +392,7 @@ sSquared.reduce (_+_)
// The filter function takes a predicate (a function from A -> Boolean) and
// selects all elements which satisfy the predicate
List(1, 2, 3) filter (_ > 2) // List(3)
case class Person(name:String, phoneNumber:String)
List(
Person(name = "Dom", age = 23),
Person(name = "Bob", age = 30)
@@ -396,6 +401,7 @@ List(
// Scala a foreach method defined on certain collections that takes a type
// returning Unit (a void method)
val aListOfNumbers = List(1, 2, 3, 4, 10, 20, 100)
aListOfNumbers foreach (x => println(x))
aListOfNumbers foreach println