list.js
/*
   * // Remove an item from the end of the list and return it's value
   */
Remove an item from the end of the list and return it's value
Remove an item from the end of the list and return it ' s value
pop() {
    let returnValue = this.data[this.length - 1];
    delete this.data[this.length - 1];
    this.length--;
    return returnValue; 
  }
pop ( ) { let returnValue = this . data [ this . length - 1 ] ; delete this . data [ this . length - 1 ] ; this . length -- ; return returnValue ; }
// Remove an item from the end of the list and return it's value
// Remove an item from the end of the list and return it ' s value