javascript remove first character from string

1let str = " hello";
2str = str.substring(1);

1var newStr = str.substring(1);

1var oldStr ="Hello";
2var newStr = oldStr.substring(1); //remove first character "ello"
3

1let str = 'ass';
2
3str = str.split(''); // (3) ["a", "s", "s"]
4str.shift(); // (2) ["s", "s"]
5str = str.join(''); // "ss"

1let str = 'ss';
2
3str = new RegExp('^.(.*)').exec(str)[1]; // "s"

1let str = 's';
2
3str = (function f(s) { // don't use on large strings
4  		return s.length<=1?'':f(s.slice(0, -1))+s[s.length-1]
5	})(str); // ""