JSFiddle - React, Tailwind, and code Playground

JavaScript

var str = [];
for (var i=0; i<1000000; i++) str[i] = ''+i;

var t0 = new Date();

for (var i=0;str[i]; i++) var test = str[i]*1;

var t1 = new Date();

for (var i=0;str[i]; i++) var test = parseInt(str[i],10);

var t2 = new Date();

for (var i=0;str[i]; i++) var test = + str[i];

var t3 = new Date();

alert([t1-t0, t2-t1, t3-t2]);