document.write('
');
document.write('
');
document.write('String.prototype.left = function (n) {
');
document.write(' if (n > this.length)
');
document.write(' return this;
');
document.write(' return this.substr(0, n);
');
document.write('}
');
document.write('
');
document.write('String.prototype.right = function(n) {
');
document.write(' if (n > this.length)
');
document.write(' return this;
');
document.write('
');
document.write(' return this.substr(this.length-n, n);
');
document.write('}
');
document.write('
');
document.write('
');
document.write('alert("Hello".right(2)) // Yields lo
');
document.write('alert("Hello".left(4)) // Yields Hell
');
document.write('
');
document.write('
');
document.write('
');