A JavaScript algorithm face question

Implements the and of all elements within an array.

The code is as follows:

function Add (runningtotal, CurrentValue) {   return runningtotal + currentvalue;} var nums = [1,2,3,4,5,6,7,8,9,10];var sum = nums.reduce (add); Console.log (sum); Showing 55

Please write down the implementation function of reduce.

The answers are as follows:

Array.prototype.reduce=function (callback) {
var total=0;
This.foreach (function (e) {total=callback (Total,parseint (e));});
return total;

};

A JavaScript algorithm face question