Manipulating Arrays in Javascript

Only managed a few minutes today. Some javascript learning at FreeCodeCamp.com on manipulating arrays. I assume there are many, and that these are the most basic (or commonly used?):

.push()    // appends one or more new elements to the end of an array and returns the new length of the array.

.pop()    // deletes the last element of an array, decrements the array length, and returns the value that it removed.

.unshift()    // adds an element to the beginning of the array, shifts the existing array elements up, and returns the new length of the array.

.shift()    // removes and returns the first element of the array, shifting subsequent elements down to vacant space.

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