ITI (Trade-COPA) Day-17

ITI COPA (Computer Operator & Programming Assistant) – Basic Notes

Topic- Introduction to JavaScript 

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1. Programming and Scripting Languages

A programming language is used to develop software applications, operating systems, and complex programs. Examples include C, C++, Java.

A scripting language is mainly used to control applications and automate tasks. Scripts are executed line by line without compilation.

Examples of Scripting Languages

• JavaScript

• Python

• PHP

• Shell Script

Difference

Programming Language	Scripting Language
Compiled	Interpreted
Used for software	Used for automation
Example: C, Java	Example: JavaScript

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2. Introduction to JavaScript and Its Web Applications

JavaScript is a client-side scripting language used to create interactive web pages.

Uses of JavaScript

• Form validation

• Popup messages

• Image sliders

• Menu effects

• Dynamic content update

• Animation and multimedia

JavaScript runs inside the web browser and works with HTML and CSS.

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3. Introduction to Web Servers and Their Features

A web server stores website files and delivers them to users using HTTP or HTTPS.

Examples of Web Servers

• Apache

• Nginx

• IIS

Features

• Handles multiple requests

• Provides security

• Supports scripting languages

• Works 24×7

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4. JavaScript Basics

4.1 Data Types

• Number

• String

• Boolean

• Undefined

• Null

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4.2 Variables

Variables store values.

Keywords:

• var

• let

• const

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4.3 Constants

Constants store fixed values.

const PI = 3.14;

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4.4 Type Conversion

• Number()

• String()

• Boolean()

• parseInt()

• parseFloat()

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5. Operators in JavaScript

Arithmetic Operators

+ - * / %

Comparison Operators

== === != > < >= <=

Logical Operators

&& || !

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Operator Precedence

1. Brackets

2. Arithmetic

3. Comparison

4. Logical

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6. Control Statements and Loops

Conditional Statements

• if

• if-else

• else-if

• switch

Loops

• for

• while

• do-while

• for...in

• for...of

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7. Arrays in JavaScript

An array stores multiple values in one variable.

Types

• Numeric array

• String array

• Mixed array

• Multidimensional array

Array Properties

• length

• Index starts from 0

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8. String Data Type

Strings are text values enclosed in quotes.

String Functions

• length

• toUpperCase()

• toLowerCase()

• indexOf()

• replace()

• substring()

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9. Math and Date Objects

Math Object

• Math.sqrt()

• Math.pow()

• Math.random()

• Math.round()

Date Object

• getDate()

• getMonth()

• getFullYear()

• getTime()

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10. Functions in JavaScript

A function is a reusable block of code.

Types

• User-defined

• Built-in

• Anonymous

• Arrow functions

Advantages

• Code reuse

• Easy maintenance

• Reduces repetition

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11. Built-in JavaScript Functions

• alert()

• confirm()

• prompt()

• parseInt()

• parseFloat()

• isNaN()

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12. Pop-up Boxes

Types

1. Alert box – message display

2. Confirm box – Yes/No

3. Prompt box – input from user

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13. Document Object Model (DOM)

DOM represents an HTML page as a tree structure.

Uses of DOM

• Access HTML elements

• Change content

• Modify CSS

• Handle events

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14. Animation and Multimedia in JavaScript

JavaScript can:

• Animate text and images

• Control audio and video

• Create interactive effects

Used in:

• Websites

• Games

• Educational apps

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MCQ Questions (30 – CBT Exam)

1. JavaScript is a:

A) Programming language
B) Scripting language
C) Markup language
D) Query language
Ans: B

2. JavaScript is mainly used for:

A) Database design
B) Styling pages
C) Making web pages interactive
D) Hardware control
Ans: C

3. JavaScript runs on:

A) Server
B) Browser
C) CPU
D) RAM
Ans: B

4. Which keyword is used to declare a constant?

A) var
B) let
C) const
D) static
Ans: C

5. Which is NOT a JavaScript data type?

A) Number
B) String
C) Boolean
D) Character
Ans: D

6. === operator checks:

A) Value only
B) Type only
C) Value and type
D) Assignment
Ans: C

7. Which operator is used for AND?

A) &
B) &&
C) ||
D) !
Ans: B

8. Which loop executes at least once?

A) for
B) while
C) do-while
D) for-in
Ans: C

9. Array index starts from:

A) 1
B) 0
C) -1
D) Any number
Ans: B

10. Which function displays a message box?

A) prompt()
B) confirm()
C) alert()
D) message()
Ans: C

11. Which function takes user input?

A) alert()
B) prompt()
C) confirm()
D) input()
Ans: B

12. Which object is used for math operations?

A) Number
B) Math
C) Calc
D) Integer
Ans: B

13. Which object handles date and time?

A) Time
B) Clock
C) Date
D) Day
Ans: C

14. JavaScript functions are used for:

A) Repetition
B) Storage
C) Reusability
D) Security
Ans: C

15. DOM stands for:

A) Document Object Model
B) Data Object Model
C) Digital Object Method
D) Document Oriented Model
Ans: A

16. DOM allows JavaScript to:

A) Access HTML elements
B) Compile code
C) Store data
D) Create database
Ans: A

17. Which loop is used to repeat code?

A) if
B) switch
C) loop
D) for
Ans: D

18. JavaScript is a:

A) Case-insensitive language
B) Case-sensitive language
C) Machine language
D) Assembly language
Ans: B

19. Which operator is used for OR?

A) &&
B) ||
C) !
D) ==
Ans: B

20. Which is a built-in JavaScript function?

A) print()
B) alert()
C) show()
D) input()
Ans: B

21. Which keyword declares a variable with block scope?

A) var
B) let
C) static
D) define
Ans: B

22. Which object is used for animation?

A) CSS only
B) JavaScript
C) HTML only
D) Database
Ans: B

23. JavaScript is mainly used on:

A) Server-side only
B) Client-side
C) Hardware
D) OS kernel
Ans: B

24. Which operator has highest precedence?

A) Logical
B) Comparison
C) Arithmetic
D) Assignment
Ans: C

25. JavaScript arrays can store:

A) One value
B) Multiple values
C) Only numbers
D) Only strings
Ans: B

26. Which function converts string to integer?

A) Number()
B) parseInt()
C) parseFloat()
D) String()
Ans: B

27. Which symbol is used for comments?

A) <!-- -->
B) //
C) **
D) ##
Ans: B

28. Multimedia in JavaScript includes:

A) Text only
B) Audio and video
C) Database
D) Compiler
Ans: B

29. JavaScript improves:

A) Page security only
B) Interactivity
C) Hardware speed
D) Storage
Ans: B

30. JavaScript is used with:

A) HTML only
B) CSS only
C) HTML and CSS
D) Database
Ans: C