Arrays

Question 1

Code an array iteration

Answer 1

let bestColors = [‘green’, ‘blue’, ‘yellow’]
bestColors.forEach( x => console.log(x))

Question 2

Each content item inside an array is called

Answer 2

An element

Question 3

Each element in an array has a numbered position known as

Answer 3

It’s index

Question 4

How many ways are there to declare array and what are they?

Answer 4

Two
Literal notation:
let newArr = []

Constructor

Question 5

True or False: Arrays in JavaScript are zero-indexed

Answer 5

True

Question 6

What are arrays?

Answer 6

A data structure to store ordered collections (collections of elements)

Question 7

What does pop() do?

Answer 7

Removes the last item of the array

Question 8

What does shift() do?

Answer 8

The shift() method removes the first element from an array and returns that removed element. This method changes the length of the array

Question 9

What does unshift() do?

Answer 9

The unshift() method adds one or more elements to the beginning of an array and returns the new length of the array

Question 10

What does zero-indexed mean?

Answer 10

The positions start counting from 0 rather than 1

Question 11

What is an array literal?

Answer 11

Creates an array by wrapping items in square brackets []

Question 12

What is the difference between .forEach and .map()?

Answer 12

.map() returns a new array

Question 13

What is an array underneath the hood?

Answer 13

An object