let arr = [ 0, 1, 2, 3, 4 ];

//splice
let spliced = arr.splice(3, 4);

console.log(arr); // => [ 0, 1, 2 ]

console.log(spliced); // => [ 3, 4 ]

//shift
let shifted = arr.shift();

console.log(arr); // => [ 1, 2 ]

console.log(shifted); // => 0

//pop
let popped = arr.pop();

console.log(arr); // => [ 1 ]

console.log(popped); // => 2