generator function

1function* idMaker() {
2  var index = 0;
3  while (true)
4    yield index++;
5}
6
7var gen = idMaker();
8
9console.log(gen.next().value); // 0
10console.log(gen.next().value); // 1
11console.log(gen.next().value); // 2
12console.log(gen.next().value); // 3
13// ...

1# A generator function that yields 1 for first time,
2# 2 second time and 3 third time
3def simpleGeneratorFun():
4    yield 1            
5    yield 2            
6    yield 3            
7   
8# Driver code to check above generator function
9for value in simpleGeneratorFun(): 
10    print(value)
11

1function* indexGenerator(){
2  var index = 0;
3  while(true) {
4    yield index++;
5  }
6}
7const g = indexGenerator();
8console.log(g.next().value); // => 0
9console.log(g.next().value); // => 1

1function* name([param[, param[, ... param]]]) {
2   statements
3}
4

1function* makeRangeIterator(start = 0, end = 100, step = 1) {
2    let iterationCount = 0;
3    for (let i = start; i < end; i += step) {
4        iterationCount++;
5        yield i;
6    }
7    return iterationCount;
8}