JavaScript/Generators
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Generators are part of the ECMAScript 6 language specification.
Firefox has supported the ECMAScript 6 compliant syntax for generators since 2013-12-10.[1]
Node.js (server-side JavaScript) also has supported ES6 generator syntax[2]
since 2013-05-15.[citation needed]
example
function* vehicle(){
var index = 0;
while (index < 4)
yield index++;
}
var firetruck = vehicle();
var car = vehicle();
console.log(car.next().value); // 0
console.log(car.next().value); // 1
console.log(firetruck.next().value); // 0
console.log(car.next().value); // 2
console.log(firetruck.next().value); // 1
console.log(car.next().value); // 3
console.log(car.next().value); // undefined
The function* keyword creates a generator function.[3]
Further reading
(FIXME: Say a few more words about generators. Perhaps use some or all of the following as references:
"Generators in Node.js: Common Misconceptions and Three Good Use Cases". "Coroutines no, generators yes. Why coroutines won’t work on the Web". "What Is This Thing Called Generators?". "callbacks vs generators vs coroutines".)
References