Static web pages

Dynamic web pages

Operating system development

Database management

One-way binding

Two-way binding

No binding

Event binding

A directive

A controller

An object that binds data to views

A filter

Server communication

Data storage

User interface enhancement

Database management

var

let

const

All of the above

let is block-scoped, var is function-scoped

var is block-scoped, let is function-scoped

No difference

Both are immutable

Compares values only

Compares values and types

Assigns values

Performs arithmetic

&&

+

==

!

Loop execution

Conditional execution

Declaring variables

Function creation

Boolean values

Multiple conditions

Single expression with multiple cases

Functions

To get user input

To display a message

To confirm an action

None of the above

alert()

confirm()

prompt()

input()

When a key is pressed

When a mouse click occurs

When a form is submitted

When the page loads

onload

onclick

onmouseover

onsubmit

Empty fields

Email format

Minimum password length

All of the above

onload

onsubmit

onclick

onchange

stop

break

end

exit

while

do-while

for

foreach

To execute code once before checking the condition

When condition is false initially

For infinite loops

For asynchronous programming

function myFunction()

def myFunction()

func myFunction()

declare myFunction()

A function with no name

A private function

A function that returns null

A function that doesn't execute

Using {} brackets

Using () brackets

Using [] brackets

Using < > brackets

0

1

-1

undefined

let obj = {}

let obj = []

let obj = ()

let obj = <>

. (dot operator)

: (colon operator)

->

#

try-catch

error-catch

if-else

catch-finally

To execute code only when an error occurs

To execute code regardless of the error

To terminate the program

To restart the code

Looping through arrays

Data binding

Error handling

Routing

To format data displayed to the user

To handle errors

To create animations

To make HTTP requests

Single quotes (' ')

Double quotes (" ")

Backticks (` `)

Parentheses (( ))

For declaring global variables only

For declaring block-scoped variables

For declaring function-scoped variables only

For declaring constants only

Shorter syntax for writing functions

Automatic binding of this keyword

Both A and B

No benefit

Document Object Model

Data Object Model

Document Order Method

Data Orientation Method

getElementById()

querySelector()

getElementsByClassName()

All of the above

onchange

onblur

onkeyup

onmouseover

onmouseover

onclick

onkeydown

onfocus

setInterval()

setTimeout()

clearTimeout()

delay()

setInterval()

setTimeout()

clearInterval()

repeat()

if(input.value === "")

if(input.value === null)

if(input.isEmpty())

if(input.isNull())

For string matching and pattern checking

For creating loops

For array manipulations

For DOM manipulation

A function passed as an argument to another function

A function that calls itself

A function that runs automatically

A function that returns a value

Handling asynchronous operations

Declaring variables

Creating functions

Error handling

To bind HTML elements to application data

To define a controller

To format data

To handle errors

To handle click events

To define loops

To create forms

To bind models

To get the data type of a variable

To compare variables

To create new variables

To delete variables

To get the data type of a variable

To compare variables

To create new variables

To delete variables

null is an assigned value, undefined means a variable is not initialized

Both are the same

null is for strings, undefined is for numbers

undefined is an object, null is not

ng-app

ng-init

ng-controller

ng-model

Single quotes (' ')

Double quotes ('" ')

Backticks (` `)

Parentheses (( ))

For declaring global variables only

For declaring block-scoped variables

For declaring function-scoped variables only

For declaring constants only

Shorter syntax for writing functions

Automatic binding of this keyword

Both A and B

No benefit

Document Object Model

Data Object Model

Document Order Method

Data Orientation Method

getElementById()

querySelector()

getElementsByClassName()

All of the above

onchange

onblur

onkeyup

onmouseover

onmouseover

onclick

onkeydown

onfocus

setInterval()

setTimeout()

clearTimeout()

delay()

setInterval()

setTimeout()

clearInterval()

repeat()

For string matching and pattern checking

For creating loops

For array manipulations

For DOM manipulation

A function passed as an argument to another function

A function that calls itself

A function that runs automatically

A function that returns a value

Handling asynchronous operations

Declaring variables

Creating functions

Error handling

To bind HTML elements to application data

To define a controller

To format data

To handle errors

To handle click events

To define loops

To create forms

To bind models

To get the data type of a variable

To compare variables

To create new variables

To delete variables

null is an assigned value, undefined means a variable is not initialized

Both are the same

null is for strings, undefined is for numbers

undefined is an object, null is not

ng-app

ng-init

ng-controller

ng-model

1990

1995

2000

2005

Tim Berners-Lee

Brendan Eich

Dennis Ritchie

Bjarne Stroustrup

Frontend Framework

Backend Framework

Full-stack Framework

Database Framework

To manage the application's data and logic

To style the HTML elements

To manage server-side requests

To validate forms

On the client's browser

On the server

On the database

On a middleware

Faster interactivity for the user

Secure data processing

Large-scale data storage

Avoids browser dependencies

null

0

undefined

NaN

Variables can store different types of data at runtime

Variables are strongly typed

Variable types cannot be changed

Variables must be declared before use

== checks only value, === checks value and type

== checks value and type, === checks only value

No difference

=== is used for strings only

&

||

!

^

For multiple conditions

For looping

For array handling

For declaring variables

condition ? expression1 : expression2

condition ? expression2 : expression1

if(condition) {expression}

if-else(condition)

To get a yes/no response from the user

To take user input

To display an alert message

To close the browser

true

false

null

undefined

When a key is pressed down

When a key is released

When a key is held down

When the mouse is clicked

onsubmit

onload

onclick

onblur

/^[a-zA-Z0-9]+@[a-z]+\.[a-z]+$/

/^[0-9]+$/

/[a-zA-Z]*$/

/^#.*$/

reset()

clear()

empty()

formClear()

Promises

Callbacks

Async/Await

All of the above

To convert an object to a JSON string

To convert JSON string to an object

To validate JSON

To parse JSON

To initialize application data

To create controllers

To perform routing

To handle errors

To make HTTP requests

To handle errors

To create filters

To manage animations

To make HTTP requests

To handle errors

To create filters

To manage animations

When a parameter is missing during function call

When the parameter is null

Always

Never

Functions that take other functions as arguments or return functions

Functions with more than one parameter

Functions that run only once

Functions used for form validation

let and const

var

Functions

Objects

Variables accessible throughout the entire program

Variables accessible only inside a function

Variables accessible within a block

Variables declared with const

Iterating over object properties

Iterating over array elements

Infinite looping

Breaking out of a loop

To iterate over iterable objects like arrays and strings

To iterate over object keys

To handle asynchronous loops

To iterate through JSON objects

try-catch

if-else

error-handler

throw

To manually raise an exception

To end the program

To execute a function

To debug code

To expand arrays or objects

To compress data

For variable declarations

To handle errors

Immutable variables

Function-scoped variables

Reassignable variables

Block-scoped variables

pop()

push()

shift()

unshift()

push()

pop()

concat()

slice()

delete

remove

unset

clear

To get all keys of an object

To get all values of an object

To create a new object

To delete keys of an object

object

null

undefined

boolean

JavaScript Object Notation

Java Standard Object Network

JavaScript Online Network

Java Standard Output Notation

To access outer function variables from an inner function

To handle errors

To terminate a function

To declare global variables

Data encapsulation

Faster execution

Reduced code size

Better debugging

To watch for changes in scope variables

To create filters

To handle animations

To debug applications

To update the view whenever scope variables change

To make HTTP requests

To validate forms

To create new directives

To check if a value is not a number

To check if a number is negative

To check if a number is null

To check if a variable is undefined

"use strict";

"enable strict";

"strict mode";

"use mode strict";

getElementById()

getElementByName()

getElementByClass()

getElementByValue()

classList

innerHTML

style

nodeValue

innerHTML

value

textContent

Both A and C

window

document

body

head

Date

Time

Calendar

Clock

getFullYear()

getYear()

getDate()

getMonth()

toUpperCase()

toLowerCase()

split()

replace()

trim()

split()

slice()

splice()

When the promise is fulfilled

When the promise is rejected

When the promise is pending

When the promise is canceled

To handle the resolved value of a promise

To handle errors in a promise

To pause the promise execution

To chain multiple functions

addEventListener()

setEvent()

attachHandler()

bindEvent()

Click me

Click me

Click me

Click me

Synchronization between model and view

Data transfer between two controllers

Form validation

Template compilation

To bind input data to the application scope

To define controllers

To create custom filters

To handle routing