6. Javascript

Question 1

What interactive features does Javascript allow to create? (4)

Answer 1

1. sliders
2. pop-ups
3. form validation
4. dynamic content loading

Question 2

How can Javascript HTML and CSS to update the content of a web page dynamically?

Answer 2

Without reloading the page

Question 3

Data types (3)?

Answer 3

1. Numbers: For any kind of numeric value.
2. Strings: For text data.
3. Boolean: For true/false logic.

Question 4

How are variable names called?

Answer 4

Identifiers

Question 5

What does console allow developer to do?

Answer 5

helps you debug, test, and inspect your code while working in the browser or in a development environment like VS Code

Question 6

What does an array contain?

Answer 6

Elements

Question 7

Function to convert string into integer?

Answer 7

parseInt()

Question 8

Function to convert a string into a
floating-point (decimal) number?

Answer 8

parseFloat()

Question 9

Function to format a number to a specified number of decimal places (string representation of the number)

Answer 9

toFixed()

Question 10

Output for parseInt(“Hello”)

Answer 10

Output: NaN (invalid input)

Question 11

Output for parseFloat(42.99abc)

Answer 11

42.99

Question 12

parseFloat(abc123)

Answer 12

Output: NaN (invalid input)

Question 13

Single line comment

Answer 13

// This is a single-line comment

Question 14

Multi line comment

Answer 14

/*
This is a multi-line comment.
It can span multiple lines
without any issues.
*/

Question 15

What can identifiers contain? (4)

Answer 15

1. letters
2. numbers
3. underscore
4. dollar sign

Question 16

What can’t identifier start by?

Answer 16

numbers

Question 17

Camel case notation

Answer 17

theCat

Question 18

Underscore notation

Answer 18

the_cat