6 ms·

Technically there is no iteration in filter/map/reduce at all.

• Stratoscope 7y ago
  That's incorrect. All of those functions are implemented using iteration. Consider this excerpt from the .map() polyfill on MDN: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map#Polyfill https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... // 7. Let k be 0 k = 0; // 8. Repeat, while k < len while (k < len) { // [loop body omitted] // d. Increase k by 1. k++; }