padLeft

padLeft.js

String.prototype.padLeft = function(padding, passedChar) {
	if(passedChar === undefined) {
		passedChar = " ";
	} 
	var specialChar = passedChar;
		
	var strLength = this.length;
	var padLength = padding - strLength;
	
	
	for(i = 1; i < padLength; i++){
		specialChar += passedChar;	
	}
	return specialChar+this;
	
};

var s = "a string";
var out = s.padLeft(40, '*');

console.log('Results' + '\n');
console.log(out);
console.log(out.length);
console.log(out === '********************************a string');

var out2 = s.padLeft(40);
console.log(out2.length);
console.log(out2);
console.log(out2 === '                                a string');
// out === '********************************a string';
// out === '                                a string';

This takes a string and calls a function padLeft() which accepts 2 arguments. One for the length of the padding, and the second for the special character passed. It can take no argument as well, in that case, it will be set to blank spaces.