JSFiddle - React, Tailwind, and code Playground

by Addy Osmani

JavaScript

String.prototype.trim = function()
{
    var b=0,e=this.length -1;
    while(this.substr(b,1) == " ") b++;
    while(this.substr(e,1) == " ") e--;
    alert('custom trim used');
    return this.substring(b,e+1);
}
    
 var s = new String(" Hello ");
 s=s.trim();
 alert("!" + s + "!");