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https://github.com/anower77/javascript_basic-sl-

Basic Syntax Of JavaScript- [ Console.log- Datatype- date - do-while-loop - If_condition - else_condition - elseif_condition - escapnotation - Logical_operator - Math - String - String_length - String_Method - Switch - Ternary - Variable - While_loop ]
https://github.com/anower77/javascript_basic-sl-

basic basic-javascript javascript math oop programming

Last synced: 7 days ago
JSON representation

Host: GitHub
URL: https://github.com/anower77/javascript_basic-sl-
Owner: Anower77
Created: 2022-10-31T01:03:49.000Z (about 2 years ago)
Default Branch: master
Last Pushed: 2022-10-31T01:33:52.000Z (about 2 years ago)
Last Synced: 2023-08-01T07:40:45.673Z (over 1 year ago)
Topics: basic, basic-javascript, javascript, math, oop, programming
Language: JavaScript
Homepage:
Size: 6.84 KB
Stars: 0
Watchers: 1
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md

Awesome Lists containing this project

README

        # JavaScript Basic Syntax     

## console.log

```js

    let persons = [

    {Name : 'Anower', City : 'Feni', Roll : 45},

    {Name : 'Rohan', City : 'Selyt', Roll : 35},

    {Name : 'Shadat', City : 'Nepal', Roll : 57},

    {Name : 'Shanto', City : 'Bogura', Roll : 46},

    {Name : 'Nisan', City : 'Dhaka', Roll : 78}

    ]

    // console.log(persons)

    console.table(persons)

    console.warn(persons)

    console.count(persons)

    console.dir()

    console.time()

    console.timeEnd()

    console.info()

```




## Datatype

```js

primitive

1. Number

//10, 4.5, 5, 6

2. String

'this is text' + "this is also text"

3. Boolean

true / false

4. undefined

5. null

Array

object

==========constractor==========

Boolean()

Number()

String()

Operator

Incremental

Pre Incremental - (++a) post Incremental - (a++)

assingment operator 

let a = 10

let b = 20

a += b

console.log(a)

logical operator

&& ==> true : true = true

|| ==> true : false = true

! ==> hole system always return nagetive vlaue

let a = 10

let b = 20

// console.log(a = b)//false

console.log(a == b)//false

console.log(a > b)// false

console.log(a < b)//true

console.log(a <= b)//true

console.log(a >= b)//false

console.log(a != b)//true

let a = '20'

let b = 20

console.log(a === b)

console.log(a !== b)

Bitwise Operator

&

|

~

^

<<

>>

```




## date

```js

 let date = new Date()

 console.log(date.toDateString())

 console.log(date.toTimeString())

 console.log(date.toLocaleString())

 console.log(date.getFullYear())

 console.log(date.getMonth())

 console.log(date.getDate())

 console.log(date.getHours())

 console.log(date.getMinutes())

 console.log(date.getSeconds())

 ```

 


## Do_While_Loop

```js

 //Do while loop=======

let isRunning = false

while (isRunning){

    console.log("Anower Hossina")

}//false

do {

    console.log("Anower hossain")

}//first time it's return a true

while (isRunning)

 ```

## if_condition

```js

let a = 10

let b = 20

//if condition true false

if (a > b){

    console.log('A is greater then B')

}

if (a < b){

    console.log('B is greater then A')

}

//task find the even and odd number=====

let n = 50

// if (n % 2 == 0){

//     console.log(n + ' This is even Number')

// }

// if (n % 2 == 1){

//     console.log(n + ' This is odd Number')

// }

```

 


## else_condition

 ```js

let a = 10

let b = 20

//if condition true false

if (a > b){

    console.log('A is greater then B')

}else{

    console.log('B is greater then A')

}

//task find the even and odd number=====

let n = 50

if (n % 2 == 0){

    console.log(n + ' This is even Number')

}else{//(n % 2 == 1)

    console.log(n + ' This is odd Number')

}

 ```

 


 ## else_if_condition

 ```js

let a = 20

let b = 20

//if condition true false

if (a > b){

    console.log('A is greater then B')

}else if (a < b){

    console.log('B is greater then A')

}else{

    console.log('They both are same')

}

//task find the even and odd number=====

let n = 0

if(n == 0){

    console.log(n + ' is Zero')

}else if (n % 2 == 0){

    console.log(n + ' This is even Number')

}else{

    console.log(n + ' This is odd Number')

}

 ```

 ## Escapnotation

 ```js

// ****** Most Improtent Escape Notation

let str1 = " My name is 'Anower'"  //qutation 1st way

let str2 = " My name is \'Anower\'"//qutation 2nd way

let str3 = " My name is \tAnower"  //tab 

let str4 = " My name is \nAnower"  //new line

let str5 = " My name is \\Anower"  // back shalsh(\\)

// Extra Escape notation

let str7 = " My name is \rAnower"  // Carrage return

let str8 = " My name is \bAnower"  // Back speac

console.log(str8)

 ```

 


 

 ## Logical_Operator

 ```js

// A && B

// true && true = true

// true && false = false

// false && true = false

// false && false =false

let a = 20

let b = 20

let c = 30

let d = 40

// (&&) logical and opetator

if (a > b && c > d){

    console.log('A is greater then B and C is greater then D')

}else{

    console.log('At least one condition is false')

}

// A || B

// true || true = true

// true || false = true

// false || true = true

// false || false =false

// (||) logical or opetator

if (a > b || c > d){

    console.log('A is greater then B or C is greater then D')

}else{

    console.log('At least one condition is false')

}

// (!) logical isnot opetator

let check = !(a > b)

console.log(check)

 ```

 ## Math

 ```js

//Math program

console.log(Math.E)//Exponential

console.log(Math.PI)//Pia

let n = 4.589

console.log(Math.abs(n))

console.log(Math.floor(n))

console.log(Math.ceil(n))

console.log(Math.round(n))

console.log(Math.max(400, 500, 600))

console.log(Math.min(400, 500, 600))

console.log(Math.pow(2, 3))

console.log(Math.pow(5, 2))

console.log(Math.sqrt(25))

console.log(Math.sqrt(64))

//random number generate========

console.log(Math.round(Math.random() * 5 + 1))

 ```

 


 ## String

 ```js

// introduce to String

// 'string' "string"

// ['s', 't', 'r', 'i', 'n', 'g']

let str1 = 'something' // string literal

let str2 = String('something')// string constructor

// Example to string

let n = 10

let num1 = n + ''       //1st way

let num2 = n.toString() //2nd way

let num3 = String(n)    //3rd way

console.log(num3)

 ```

 


## String Comparison

```js

// string comparison

let a = 'abc'

let b = 'def'

console.log(a < b)

// laxical comparison with string comparison

console.log( 'a'  >  'Z')//output true

console.log( 'a' < 'Z')// output false

```




## String_Length

```js

// JS String length *****Heard ways******

let str = "Anower Hossain"

let length = 0

while (true){

    if (str.charAt(length) == ""){

        break

    }else{

        length++

    }

}

console.log(length)

// JS String length *****Easy ways******

let str1 = "Sanower Hossain"

console.log(str1.length)

console.log('This is a speacial String  length method'.length)

```




## String Method

```js

// JS String Methods=====

let a = 'I am'

let b = 'Anower Hossain'

let c = a.concat(' ', b)

// console.log(c)

// let d = c.substring(4, 11)

// console.log(d)

// console.log(c.charAt(3))

// console.log(c.startsWith('I'))

// console.log(c.endsWith("Hossain"))

// console.log(a.toUpperCase())

// console.log(b.toLowerCase())

console.log('       Extra_Speace_Remove         '/*.trim()*/)

console.log(c.split(' '))

```




## Switch Statement

```js

// 0- sunday, 1- monday, 3- tuesday

let date = new Date()

let today = date.getDay()

switch (today) {

    case 0:

        console.log('Today is sunday')

        break

    case 1:

        console.log('Today is Monday')

        break

    case 2:

        console.log('Today is Tuesday')

        break

    case 3:

        console.log('Today is Wednesday')

        break

    case 4:

        console.log('Today is Thursday')

        break

    case 5:

        console.log('Today is Friday')

        break

    case 6:

        console.log('Today is Saturday')

        break

    default: 

        console.log('Nor a value Number')

}

// find free and weekday for task (HW)

// switch (new Date().getDay()) {

//     case 6:

//       console.log("Today is Saturday")

//       break;

//     case 0:

//       console.log("Today is Sunday")

//       break;

//     default:

//       console.log("Looking forward to the Weekend")

//   }

// Referance to web ship =========

// let amount = 400

// switch (amount){

//     case 100:

//         console.log('That is 100')

//         break

//     case 200:

//     case 300:

//     case 400:

//         console.log('That is 200 or 300 or 400')

//         break

//     default:

//         console.log('Invalid Amount')

// }

```




## Ternary Operator

```js

let n = 11

let str = ''

if(n % 2 == 0){

    str = "EVEN Number"

}else{

    str = "ODD Number"

}

console.log(str)

// condition ? true side : false side

let result = (n % 2 == 0) ? "EVEN" : "ODD"

console.log(result)

// 27 class must be seen==>

```




## Variables

```js

//follow all instruction and read notes

let fullName = "Anower hossain"

console.log("This is " + fullName)

```




## While_Loop

```js

// while loop======>

let i = 0

while (i <= 5){

    console.log(i + ". Anower Hossain")

    i++

}

//while project=====

// let isRunning = true

// while (isRunning){

    

//     let rand = Math.floor(Math.random() * 10 + 1)

//     if(rand == 10){

//         console.log("Winner Winner Chicken Dinner")

//         isRunning = false

//     }else{

//         console.log("Your have got " + rand)

//     }

// }

```