JS ARRAYS

Question 1

What are arrays used for?

Answer 1

Arrays are used for storing a list values within one variable, are sorted by position

Question 2

Describe array literal notation.

Answer 2

var array = [array0, array1, array2]

Question 3

How are arrays different from “plain” objects?

Answer 3

Objects are used to represent a “thing” in your code. That could be a person, a car, a building, a book, a character in a game — basically anything that is made up or can be defined by a set of characteristics. In objects, these characteristics are called properties that consist of a key and a value.

vs

We use arrays whenever we want to create and store a list of multiple items in a single variable. Arrays are especially useful when creating ordered collections where items in the collection can be accessed by their numerical position in the list.

Question 4

What number represents the first index of an array?

Answer 4

0, memory space

Needs to move 0 spaces to get first value

Question 5

What is the length property of an array?

Answer 5

Shows how many values are inside an array

Question 6

How do you calculate the last index of an array?

Answer 6

array[array.length-1]

length property