Run results for: reduce vs while

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36

Browser: Chrome 61

Operating system: Windows

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
Reduce	15690.1 Ops/sec
while	50946.6 Ops/sec

Tests:

Reduce
const charOccurances = str => str .split("") .reduce((p, c) => ({ ...p, [c]: (p[c] || 0) + 1 }), {}); console.log(charOccurances('abacgxhetxghxydfbfdrfdbftyjzbbvbvbv'));
while
const charOccurances = (str = "") => { const response = {}; while(str.length !== 0) { const char = str.charAt(); const reg = new RegExp(char, "g"); response[char] = str.match(reg).length; str = str.replace(reg, ""); } return response } console.log(charOccurances('abacgxhetxghxydfbfdrfdbftyjzbbvbvbv'));