function* idMaker() {
var index = 0;
while (true)
yield index++;
}
var gen = idMaker();
console.log(gen.next().value); // 0
console.log(gen.next().value); // 1
console.log(gen.next().value); // 2
console.log(gen.next().value); // 3
// ...
function* expandSpan(xStart, xLen, yStart, yLen) {
const xEnd = xStart + xLen;
const yEnd = yStart + yLen;
for (let x = xStart; x < xEnd; ++x) {
for (let y = yStart; y < yEnd; ++y) {
yield {x, y};
}
}
}
//this is code from my mario game I dont think this code is functional// define a generator function
function* generator_function() {
... .. ...
}
// creating a generator
const generator_obj = generator_function();