Javascript String Prototype Slice from left and right

String.prototype.left = function(count) {
  return this.slice(0, count);
}

String.prototype.right = function(count) {
  return this.slice(-count);
}

let myString = "The quick brown fox.";

console.log( myString.left(10));//from   w  w w  .  jav a  2s .  com

console.log( myString.right(10) );