June 25, 2022June 25, 2022 SRISIIM

Important things to learn in javascript

1

Javascript is a event based Programming Language

Javascript Events:

Click
Double Click
Right Click
Mouse Hover
Mouse Out
Drag Drop
Key Press
Key Up
Load
Unload
Resize
Scroll

 

Q.: How may kinds of comment in Javascript

Ans: There are two comments in javascript

1. Single line Comments //
2. Multiple line comments */  /*

 

Q: How May types of Variable in Java Script

Ans: There are Tree types of variable in Javascript

1. Var     (With variable we can declare and assign or override the value multiple times.)
2. Let      (With let variable we can override the value but we can’t declare the the value again)
3. Const  (Once we declare the value we can’t declare again and can’t override)

Q: How Many types of Data Types in Javascript

Var x = “hello world”; —————————string
var x = 25; ——————————————-Number
var x = true/false; ——————————–Boolean
Var x = [“HTML”, “CSS”, “JS”];______Array
var x = {first:”jan”, last:”Feb”}; ————Object
var x = null; —————————————–null
var x: ———————————————–—undefined

 

Q: What is Arithmetic operators

+	Addition
–	Subtraction
*	Multiplication
**	Exponentiation
/	Division
%	Modulus (Remainder)
++	Increment
—	Decrement

This Arithmetic operators work on numbers.

 

Q: Assignment Operators

Ans: Below are Assignment Operators

1. -=
2. +=
3. *=
4. /=
5. %=
6. **=

Q: Comparison Operators

OPERATOR	DESCRIPTION
==	Equal to	a==b
===	Equal value and equal type	Data type must be equal
!=	Not Equal
!==	Not equal value or not equal type
>	greater than
<	Less than
>=	Greater than or equal to
<=	less than or equal to

 

Q: What is ternary Operator

Ans:

Q: what is Switch Statement?

Ans:

Q: how many popup boxes in javascript

Ans: 1 alert 2. confirm 3. Prompt

Q What is javascript function and function with parameters write code?

Q: Local and Global Variable ?

Q: Javascript Events?

1. click (onlick)
2. double

Q: how may types of  Loop in Javascript 

Ans:

1. while loop
2. do/while loop
3. for loop
4. for/in loop (Objects)
5. for Each (array)

Q: Learn Nested Loop ergent

 

Q: Array Methods

ans:

1. sort()
2. reverse()
3. pop()
4. push()
5. shift()
6. unshift()
7. concat()
8. join()
9. slice()
10. splice()
11. isArray()
12. indexOf()
13. lastIndexOf()
14. entries()
15. every()
16. filter()
17. find()
18. findIndex()
19. includes()
20. some()
21. forEach()
22. toString()
23. valueOf()
24. fill()

 

Q What is Objects

 

Q String Methods:

22 Methods

 

Q. Javascript Math Methods:

1. ceil(x)
2. floor(x)
3. found(x)
4. trunc(x)
5. max(x,y,z…n)
6. min(x, y, ….n)
7. sqrt(x)
8. cbrt(x)
9. pow(x,y)
10. random(x)
11. abs(x)
12. PI

 

Q: Date Methods

1. toDateString()
2. getDate()
3. getFullYear()
4. getMonth()
5. getDay()
6. getHour()
7. getminuts()
8. getSeconds()
9. getMilliseconds()
10. setDate()
11. setFullYear()
12. setHours()
13. setMilliseconds()
14. setMinutes
15. setMonth()
16. setSeconds()

 

 

Q: DOM (Document Object Module)

DOM Targeting Methods

1. document
2. document.all
3. document.documentElement
4. document.head
5. document.title
6. document.body
7. document.images
8. document.anchors
9. document.links
10. document.forms
11. document.doctype
12. document.URL
13. document.baseURI
14. document.domain