Merge multiple arrays based on their index using javascript

Question

I need to merge two arrays into a single array. I have code but it is not working as expected-- it is merging them one after another, but I need to interlock the values.

Answer 1

Well actually JavaScript lacks a .zip() functor which would be very handy for exactly what you are trying to do. Lets invent it;

Array.prototype.zip = function(a){
 return this.map((e,i) => typeof e === "object" || typeof a[i] === "object" ? [e,a[i]] : e+a[i]);
};

var arrays = [[1, 2, 3, 4],
              ["a", "b", "c", "d"],
              [9, 8, 7, 6],
              ["z", "y", "x", "w"],
              [[1,2,3],[4,5,6],[7,8,9],[10,11,12]]
             ],
result = arrays.reduce((p,c) => p.zip(c));
console.log(result);