JSFiddle - React, Tailwind, and code Playground

JavaScript

var kiko = [1, 2, 3, 4, 5, 6];

var forEach = function (array, newArray, action) {
    for (var i = 0; i < array.length; i++) {
        action.call(newArray, array[i]);
    };
};
var newArray = [];
forEach(kiko, newArray, Array.prototype.push)
console.log(newArray); // [1, 2, 3, 4, 5, 6]