Loop structures: Difference between revisions

==[[Groovy]]==

[[Category:Groovy]]

===While Loops===

while (true) {

println 'groovy'

}

===For Loops===

<pre>

// iterate over a range

x = 0

for (i in 1..3) { x += i }

assert x == 6

// iterate over a list

x = 0

for (i in [1, 2, 3]) { x += i }

assert x == 6

// iterate over an array

x = 0

for (i in (1..3).toArray()) { x += i }

assert x == 6

// iterate over a map's key/value pairs

x = 0

for (i in map) { x += i.value }

assert x = 6

// iterate over a map's values

x = 0

for (i in map.values()) { x += i }

assert x == 6

// iterate over the characters in a string

text = 'abc'

list = []

for (c in text) { list.add(c) }

assert list == ['a', 'b', 'c']

</pre>

===Closures===

<pre>

def stringList = [ "java", "perl", "python", "ruby" ];

def stringMap = [ "Su" : "Sunday", "Mo" : "Monday", "Tu" : "Tuesday",

"We" : "Wednesday", "Th" : "Thursday", "Fr" : "Friday",

"Sa" : "Saturday" ];

stringList.each() { print " ${it}" }; println "";

// java perl python ruby

stringMap.each() { key, value -> println "${key} == ${value}" };

// Su == Sunday

// We == Wednesday

// Mo == Monday

// Sa == Saturday

// Th == Thursday

// Tu == Tuesday

// Fr == Friday

stringList.eachWithIndex() { obj, i -> println " ${i}: ${obj}" };

// 0: java

// 1: perl

// 2: python

// 3: ruby

stringMap.eachWithIndex() { obj, i -> println " ${i}: ${obj}" };

// 0: Su=Sunday

// 1: We=Wednesday

// 2: Mo=Monday

// 3: Sa=Saturday

// 4: Th=Thursday

// 5: Tu=Tuesday

// 6: Fr=Friday

</pre>