How do you split an array into array pairs in JavaScript?

Question

I want to split an array into pairs of arrays.

var arr = [2, 3, 4, 5, 6, 4, 3, 5, 5] 

would be

var newarr = [     [2, 3],     [4, 5],     [6, 4],     [3, 5],     [5] ] 

Answer 1

You can use js reduce

initialArray.reduce(function(result, value, index, array) {   if (index % 2 === 0)     result.push(array.slice(index, index + 2));   return result; }, []); 

Answer 2

Lodash has a method for this: https://lodash.com/docs/4.17.10#chunk

_.chunk([2,3,4,5,6,4,3,5,5], 2); // => [[2,3],[4,5],[6,4],[3,5],[5]]