JSFiddle - React, Tailwind, and code Playground

JavaScript

oldArray = [0,1,2,3,4,5,6,7,8,9,10]
chunkSize = 2;

    newArray = (function(array, chunk) {
        retArr = [];
        for (var i = 0; i < array.length; i+=chunk)
           retArr.push(array.slice(i,i+chunk));
        return retArr;
    }(oldArray, chunkSize))
          
       
console.log(newArray)