Compare string to array convertio

Compares function with and without using regexp.

by Maciej Sikora

HTML

<script src="https://cdn.rawgit.com/StartCodingPL/startjs/master/startjs.js"></script>
<script src="https://cdn.rawgit.com/maciejsikora/Speeder/master/speeder.js"></script>

JavaScript

//solution without regexp
function convertStringToArray(str, maxPartSize){

  const chunkArr = [];
  let leftStr = str;
  do {

    chunkArr.push(leftStr.substring(0, maxPartSize));
    leftStr = leftStr.substring(maxPartSize, leftStr.length);

  } while (leftStr.length > 0);

  return chunkArr;
};

//solution with regexp
function convertStringToArrayRegex(str, maxPartSize){
  
  const reg = new RegExp(".{1,"+maxPartSize+"}", "g");
	return str.match(reg);

};

//create example string
function createString(size){

  const symbols=["a","b","c","d","e","f","1","2","3","4"];

  let str="";
  for ( let i = 0; i<size; i++){

    str+=symbols[Math.floor((Math.random() * 10))];
  };

  return str;
}

//TEST PERFORMANCE
const sp=new Speeder();

info("TEST ON 30 CHAR STRING");
str=createString(30);

sp.start("noregex");
convertStringToArray(str, 5);
sp.end("noregex");
write(sp.result("noregex"));

sp.start("regex");
convertStringToArrayRegex(str, 5);
sp.end("regex");
write(sp.result("regex"));

info("TEST ON 1000 CHAR STRING");
str=createString(1000);

sp.start("noregex");
convertStringToArray(str, 5);
sp.end("noregex");
write(sp.result("noregex"));

sp.start("regex");
convertStringToArrayRegex(str, 5);
sp.end("regex");
write(sp.result("regex"));

info("TEST ON 10000 CHAR STRING");
str=createString(10000);

sp.start("noregex");
convertStringToArray(str, 5);
sp.end("noregex");
write(sp.result("noregex"));

sp.start("regex");
convertStringToArrayRegex(str, 5);
sp.end("regex");
write(sp.result("regex"));

info("TEST ON 1 000 000 CHAR STRING");
str=createString(1000000);

sp.start("noregex");
convertStringToArray(str, 5);
sp.end("noregex");
write(sp.result("noregex"));

sp.start("regex");
convertStringToArrayRegex(str, 5);
sp.end("regex");
write(sp.result("regex"));

info("TEST ON 1 000 000 CHAR STRING WITH BIG CHUNKS");
str=createString(1000000);

sp.start("noregex");
convertStringToArray(str,...