One possible implementation could be

function customEvery(callback, thisArg) {
  // DO NOT REMOVE
  'use strict';

  // Write your solution below
  if (this === null || this === undefined) {
    throw new TypeError('Array.prototype.every called on null or undefined');
  } else if (typeof callback !== 'function') {
    throw new TypeError('callback must be a function');
  }

  var list = Object(this);
  var thisArg = arguments[1] || this;
  var currentValue = undefined;
  var length = list.length || 0;

  // write your solution below
  for (let i = 0; i &lt; length; i++) {
    currentValue = list[i];

    if (i in list &amp;&amp; !callback.call(thisArg, currentValue, i, list)) {
      return false;
    }
  }

  return true;
}

Array.prototype.customEvery = customEvery;

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How to implement Array.prototype.every? JavaScript Interview Question | Problem Solving | JavaScript Polyfills

@Yomesh Gupta