JSFiddle - React, Tailwind, and code Playground

JavaScript

function ab2str(buf) {
            var u16arr = new Uint16Array(buf);
            var ret = "";
            for ( var i = 0 ; i < u16arr.length ; i++ )
                ret += String.fromCharCode(u16arr[i]);
            return ret;
		}

		function str2ab(str) {
		  var buf = new ArrayBuffer(str.length*2); // 2 bytes for each char
		  var bufView = new Uint16Array(buf);
		  for (var i=0, strLen=str.length; i<strLen; i++) {
		    bufView[i] = str.charCodeAt(i);
		  }
		  return buf;
		}

var str = "";
for ( var i = 0 ; i < 10000 ; i++ )
    str += "abcdefghijklmnopqrstuvwxyz";

var ab = str2ab(str);
console.log(ab);
var s = ab2str(ab);
console.log(s == str);