Ten important things in javascript which is need for all.

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Javascript syntax:

The syntax of javascript is the sot of rules that define a structured javascript programm.

Example:

var m , n, o; //Declare variables ;

m=6; n=7; //Assign values

o =m + n //compute values

“The javascript has two values”

1. Fixed value (literal)
2. Variable value (variable)

Variables:

Variable means anything that can vary and you can put a value declared a variable. Variable declared with the “var” keyword. you also declared with let and const which is version of ES6.

Example

var a = 4;

let a = 4;

const a = 4;

all are correct;

Operators:

Operator is a special symbol which is used for assignment , comparison, logical, Bitwise. Assignmet operators assign values( =, -, *, /, ==, !=, &&, ||) etc.

Example

x=7; //assign the value 7 to x;

x != y

CONDITION:

Javascript condition are multiple different types of conditons which are used to perform different actions based on different conditions. In javascript programm we can follow three conditional statements.

1. if
2. else if
3. else.

Example

If( apple ){

eat

}else if (orange){

don’t eat

}else {

throw it in the dustbin

}

LOOP

Loop are used in Javascript to perform return tasks based on a condition. Conditions typically return true or false when analysed. Javascript used basically three type of loop;

1. for…..loop,
2. do…loop,
3. while….loop.

Example

for(var i = 0; i <8 ; i++){

var num = num + i;

}

FUNCTION

Function is a group of reuseable code which can be called anywhere in your programm. Functions are object. Javascript function are defined with the “function” keyword.

Example

function myNumbe(a, b){

//code to be executed

return a*b;

}

ARRAY:

Javascript array means where you store multiple values in a single variable. And access the elements of an array by index number. In generally the first element of an array is index 0;

Example

var phones = [‘samsung’ , ‘iphone’, ‘oop’ , ‘redme’];

var phone = phones[0];

console.log(phone); // samsung

OBJECT:

Object is the most important in Javascript programm. If you understand object . You understand Javascript . Object has two properties ( one call key and another call value) pairs and separared by “ : ” colon. Object like variable but object can store many values.

Example

var friend = {

friendName: ‘sarra’,

age: 25,

job: ‘facebooking’,

school: ‘porirdese’

}

DATA TYPES CONCEPT :

A value in javascript is always of a certain type . Data types are used to know , this value is which type of data. Six Data types are primitive.

1. Number
2. String
3. Boolean
4. Undefined
5. BigInt
6. Symbol

How can you find this ?

Example

var akash = ‘upore’

console.log(type of(akash)) // string

COMPARISONS :

Javascript comparisons normally compare in two values by conditional or loigcal.

Example

if(num< 10)? ‘small num’ : ‘big number’;

if(num =10 || num =15)? ‘ok’ : ‘change it’