Array modification (push, pop, shift, unshift) in Ruby - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the push method do in a Ruby array?

The push method adds one or more elements to the end of an array.

beginner

How does the pop method modify an array?

The pop method removes the last element from an array and returns it.

beginner

What is the difference between shift and pop in Ruby arrays?

shift removes the first element of the array, while pop removes the last element.

beginner

What does the unshift method do in a Ruby array?

The unshift method adds one or more elements to the beginning of an array.

beginner

If you have arr = [1, 2, 3] and you run arr.unshift(0), what will arr be?

The array will be [0, 1, 2, 3] because unshift adds the element 0 to the start.

Which method removes the last element from a Ruby array?

A pop

B shift

C push

D unshift

The pop method removes and returns the last element of the array.

What does arr.push(4) do if arr = [1, 2, 3]?

A Adds 4 to the beginning of the array

B Removes the first element

C Adds 4 to the end of the array

D Removes the last element

push adds the element to the end of the array.

Which method removes the first element from a Ruby array?

A shift

B unshift

C push

D pop

shift removes and returns the first element of the array.

What will arr.unshift(0) do to arr = [1, 2, 3]?

A Remove the first element

B Remove the last element

C Add 0 to the end

D Add 0 to the beginning

unshift adds elements to the start of the array.

If you want to add an element to the end of an array, which method should you use?

A pop

B push

C shift

D unshift

Use push to add elements to the end of an array.

Explain how the methods push, pop, shift, and unshift modify a Ruby array.

Think about adding or removing elements from the start or end of the array.

Describe a real-life situation where you might use shift and pop on an array.

Imagine a line of people or a stack of objects.