JSFiddle - React, Tailwind, and code Playground

JavaScript

var a = ["hello", "world", "how", "are", "you"];

var s = new Date();
for(var i = 0; i < 10000; i++) {

var b = a.filter(function(el,idx,arr) {
    return typeof el == "string" && el.indexOf("h") != -1;
});

}
var e = new Date();
    
alert((e.getTime() - s.getTime()) + "ms");