Arrays & Methods

What does this output?

const arr = [1, 2, 3]
const result = arr.reduce((acc, val) => acc + val, 0)
console.log(result)

Which method removes the LAST element and returns it?

const arr = [1, 2, 3]
const last = arr._______
// last = 3, arr = [1, 2]

What is the output?

const a = [1, 2, 3]
const b = a
b.push(4)
console.log(a)