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</ref> [[C Sharp (programming language)|C#]],<ref>
[http://msdn.microsoft.com/en-us/library/9k7k7cf0.aspx yield (C# Reference)]
</ref> [[Ruby (programming language)|Ruby]], the upcoming version of ECMAScript (Harmony/ES6) and other languages. In CLU and C#, generators are called ''iterators'', and in Ruby, ''enumerators''.
===Lisp===
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else:
break
</source>
===ECMAScript===
ECMAScript 6 (AKA Harmony) will feature generator functions.
An infinite Fibonacci sequence can be written using a function generator:
<source lang="javascript">
function* fibonacci() {
let init = 1;
yield init;
let [prev, curr] = [0, init];
while (true) {
[prev, curr] = [curr, prev + curr];
yield curr;
}
}
var gen = fibonacci();
console.log(gen.next().value); // 1
console.log(gen.next().value); // 1
console.log(gen.next().value); // 2
console.log(gen.next().value); // 3
console.log(gen.next().value); // 5
console.log(gen.next().value); // 8
</source>
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