pop(): Remove an item from the end of an array (returns the removed item)
push(parameterToAdd): Add items to the end of an array (returns the new array length)
shift(): Remove an item from the beginning of an array (returns the removed item)
unshift(parameterToAdd): Add items to the beginning of an array (returns the new array length)
let myArray = ['Record1', 'Record2', 'Record3']
myArray.pop(); //['Record1', 'Record2']
myArray.push('Record4') //['Record1', 'Record2', 'Record4']
myArray.shift() //['Record2', 'Record4']
myArray.unshift('Record5') //['Record5', 'Record2', 'Record4']