WEEK 1O

Question 1

The JavaScript ___ are meaningful way to deliver message. It is used to add information about the code, warnings or suggestions so that end user can easily interpret the code.

Answer 1

comments

Question 2

The JavaScript comment is ___ by the JavaScript engine i.e. embedded in the browser.

Answer 2

ignored

Question 3

Advantages of JavaScript comments

Answer 3

1. To make code easy to understand
2. To avoid the unnecessary code, it can also be used to avoid the code being executed.

Question 4

Two types of comments in JavaScript.

Answer 4

• Single-line Comment
• Multi-line Comment

Question 5

It is represented by double forward slashes (//). It
can be used before and after the statement.

Answer 5

JavaScript Single line Comment -

Question 6

It can be used to add single as well as multi line
comments. So, it is more convenient. It is represented by forward slash with asterisk then asterisk with forward slash.

Answer 6

JavaScript Multi line Comment

Question 7

A JavaScript ___ is simply a name of storage location.

Answer 7

variable

Question 8

There are two types of variables in JavaScript:

Answer 8

local variable and global variable

Question 9

A JavaScript ___ is accessible from any function. A variable i.e. declared outside the function or declared with window object is known as global variable.

Answer 9

global variable

Question 9

There are some rules while declaring a JavaScript variable (also known as identifiers)

Answer 9

1. Name must start with a letter (a to z or A to Z), underscore (_ ), or dollar( $ ) sign.
2. After first letter we can use digits (0 to 9), for example value1.
3. JavaScript variables are case sensitive, for example x and X are different variables.

Question 9

A JavaScript ___ is declared inside block or function. It is accessible within the function or block only.

Answer 9

local variable

Question 10

JavaScript provides different data types to hold different
types of values.

Answer 10

Javascript Data Types

Question 11

JavaScript is a ___, means you don’t need to specify type of the variable because it is dynamically used by JavaScript engine.

Answer 11

dynamic type language

Question 12

There are two types of data types in JavaScript:

Answer 12

• Primitive data type
• Non-primitive (reference) data type

Question 13

Five types of primitive data types in JavaScript:

Answer 13

1. String
2. Number
3. Boolean
4. Undefined
5. Null

Question 14

___ represents sequence of characters e.g. “hello”

Answer 14

String

Question 15

___ represents numeric values e.g. 100

Answer 15

Number

Question 16

___ represents boolean value either false or true

Answer 16

Boolean

Question 17

___ represents undefined value

Answer 17

Undefined

Question 18

The non-primitive data types are as follows:

Answer 18

1. Object
2. Array
3. RegExp

Question 18

___ represents null i.e. no value at all

Answer 18

Null

Question 19

___ represents instance through which we can access members

Answer 19

Object

Question 20

___ represents group of similar values

Answer 20

Array

Question 21

___ represents regular expression

Answer 21

RegExp