Edit in JSFiddle

var numbers = ['one', 'two', 'three', 'four'];

numbers.push('five'); //adds five to the end of the numbers array
//numbers.pop(); //removes the last value in the numbers array (five)
//numbers.unshift('zero'); //adds to the beginning to the numbers array
//numbers.shift(); //removes the first value in the numbers array (zero)
console.log(numbers);