Nodejs Array Every every(fun /*, thisp */)

Method Source Code

Array.prototype.every = Array.prototype.every || function(fun /*, thisp */) {
  "use strict";/* w w w  .ja  v a 2s.c om*/
  if (this === void 0 || this === null) throw new TypeError();
  var t = Object(this);
  var len = t.length >>> 0;
  if (typeof fun !== "function") throw new TypeError();
  var thisp = arguments[1];
  for (var i = 0; i < len; i++) {
    if (i in t && !fun.call(thisp, t[i], i, t)) return false;
  }
  return true;
};

every(fn, context)

Array.prototype.every = function(fn, context) {
  if (typeof fn != "function") {
    throw new TypeError(fn + " is not a function");
  if (typeof context === 'undefined') {
    context = this;
  for (var i = 0, l = this.length; i < l; i++) {
    if (this.hasOwnProperty(i) && !fn.call(context, this[i], i, this)) {
...

every(fun /*, thisp*/)

Array.prototype.every = Array.prototype.every || function(fun )  {
    var len = this.length >>> 0;
    if (typeof fun != "function") {
        throw new TypeError();
    var thisp = arguments[1];
    for (var i = 0; i < len; i++) {
        if (i in this &&
            !fun.call(thisp, this[i], i, this)) {
...

every(isOk)

const array = [1, 42, 7, 9, 13, 10, 20, 35, 45, -7, -3, 0, 4, -1, 15];
Array.prototype.every = function(isOk) {
  const len = this.length;
  for(let i = 0; i < len; i += 1) {
    console.log(isOk(this[i], i, this));
    if(!isOk(this[i], i, this)) {
      return false;
  return true;
};
Array.prototype.some = function(isOk) {
  const len = this.length;
  for(let i = 0; i < len; i += 1) {
    if(isOk(this[i], i, this)) {
      return true;
  return false;
};
console.log(array.some(x => x < 10));
console.log(array.some(x => x > 100));
console.log([1,2,3].some(x => x < 10));
function isIncreasing(x, i, arr) {
  if(i === 0) {
    return true;
  return arr[i - 1] < x;
console.log([1,2,3].every(isIncreasing));
console.log([42, 1, 2, 3].every((x, i) => x % 2 === i % 2));

every(iterator)

Array.prototype.every = function(iterator) {
  for (var i = 0, len = this.length; i < len; i++) {
    if (!iterator(this[i], i)) {
      return false;
  return true;
};

everySyncasync (callback, thisArg)

Array.prototype.everySync = async function (callback, thisArg) {
  for (let [index, item] of Object.entries(this)) {
    if (!await callback(item, index, this)) return false
  return true

Nodejs Array Every every(fun /, thisp /)

Method Source Code

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