Class 1/18

Question 1

What does the = (equals) operator do in JavaScript?

Answer 1

It assigns values

Question 2

Which keyword is used to declare a variable in JavaScript?

Answer 2

var

Question 3

Which characters is a JavaScript variable allowed to begin with?

Answer 3

$ and _

Question 4

What are quotation marks used for in JavaScript?

Answer 4

Strings

Question 5

What is the purpose of strings in JavaScript?

Answer 5

They are used for text values

Question 6

What is the purpose of booleans in JavaScript?

Answer 6

Represented by true or false, data that can only have 1 of 2 values

Question 7

What is the purpose of numbers in JavaScript?

Answer 7

Unsure

Question 8

What does null mean in JavaScript?

Answer 8

Lack of any value, not undefined

Question 9

What data types can object properties hold?

Answer 9

They can hold any data type

Question 10

Describe the syntax (structure) of object-literals in JavaScript.

Answer 10

const person = {firstName:”John”, lastName:”Doe”, age:50, eyeColor:”blue”};

Question 11

What is the principal use of arrays?

Answer 11

An array can hold many values under a single name, and you can access the values by referring to an index number.

Question 12

Describe the syntax (structure) of array-literals in JavaScript.

Answer 12

const array_name = [item1, item2, …];

Question 13

What number represents the first index of an array?

Answer 13

0

Question 14

How can you access the last element of an array?

Answer 14

let fruit = fruits[fruits.length - 1];