Run results for: Generator and for-of

Run details:

User agent: Mozilla/5.0 (Android 13; Mobile; rv:131.0) Gecko/131.0 Firefox/131.0

Browser: Firefox Mobile 131

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

ES6 generator

19K/s

Closure polyfill

18K/s

View exact numbers

Test name	Executions per second
✓ ES6 generator	19,156 Ops/sec
Closure polyfill	18,428 Ops/sec

Script Preparation code:

function* createGenerator() {
  var i;
  for (i = 0; i < 100; i++) {
    yield i;
  }
}

function createClosure() {
  var i = 0;
  return {
    [Symbol.iterator]() {
      return this;
    },
    next() {
      var result;
      if (i < 100) {
        result = {
          value: i,
          done: false
        };
      } else {
        result = {
          value: undefined,
          done: true
        };
      }
      i++;
      return result;
    }
  };
}

Tests:

ES6 generator
var gen = createGenerator(), result; for (result of gen) { window.result = result.value; }
Closure polyfill
var gen = createClosure(), result; for (result of gen) { window.result = result.value; }