javascript remove first character from string

let str = " hello";
str = str.substring(1);var oldStr ="Hello";
var newStr = oldStr.substring(1); //remove first character "ello"
var newStr = str.substring(1);let str = 'ass';

str = str.split(''); // (3) ["a", "s", "s"]
str.shift(); // (2) ["s", "s"]
str = str.join(''); // "ss"let str = 'ss';

str = new RegExp('^.(.*)').exec(str)[1]; // "s"let str = 's';

str = (function f(s) { // don't use on large strings
  		return s.length<=1?'':f(s.slice(0, -1))+s[s.length-1]
	})(str); // ""