Write javascript polyfill for array.reduce
// Example: Predefined Array.reduce // let arr = [1,2] // arr.reduce((total, current) => total, initialvalue) // let newArr = arr.reduce((total, current) => total + current, 0) // console.log('hello new: ', newArr) /* Polyfill for reduce */ function myreduce(cb, init) { let copyArr = this; let arrLen = copyArr.length; // output let acc = init; // traverse right to left while(arrLen) { let currItem = copyArr[arrLen - 1]; acc = cb(acc, currItem); arrLen--; } return acc; } Array.prototype.myreduce = myreduce; console.log('Polyfill: ', [1, 2].myreduce((total, current) => total + current, 0)); // Output: 3