What are operators

When we write a programs in JavaScript, we often need to perform calculations, compare values or make decisions. This is where operators come into play. Operators are the building blocks of JavaScript expressions and can manipulate data in various ways.

JavaScript provides many types of operators, but in this article we will focus on the most commonly used ones :

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Arithmetic operators ( +, - , * )

Arithmetic Operators are used to perform mathematical calculations like addition, subtraction, multiplication, etc.

Addition ( + )

let a=10;
let b=20;

console.log(a + b);

Subtraction ( - )

let a=10;
let b=20;

console.log(a - b);

Multiplication ( * )

let a=10;
let b=20;

console.log(a * b);

Division ( / )

let a=10;
let b=20;

console.log(a / b);

Modulus ( % )

The modulus operator returns the remainder after division.

let a=10;
let b=3;

console.log(a % b);    // output : 1

Why output is 1 ?

Because 10 % 3 = 3 remainder 1

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Comparison operators

Comparison operators are used to compare two values. This operators returns true or false.

Equal To ( == )

This checks if values are equal after type conversion.

console.log(5 == "5"); //output: true

JavaScript converts "5" ( string) into 5 (number).

Strict Equal To ( === )

This checks values and type both.

console.log(5 == "5"); //output: false

Not Equal ( != )

console.log(5 != 3); //output: true

Greater Than ( > )

console.log(10 > 6); //output: true

Less Than ( < )

console.log(10 < 16); //output: true

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Logical operators

Logical operators are mainly used to perform the logical operations that determine the equality or difference between the values. This operators are used when working with conditions.

AND (&&)

AND logical operators returns true only if both conditions are true.

let age = 20;

console.log(age > 18 && age < 30); //output: true

OR (||)

OR Logical operators returns true if at least one condition is true.

let age = 20;

console.log(age > 18 || age < 30); //output: true

NOT (!)

NOT logical operators returns the reverses of boolean value.

let isLoggedIn = false;

console.log(!isLoggedIn); //output: true

Truth Table for Logical Operators

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Assignment operators

Assignment operators are the sign values to variables.

Basic Assignment ( = )

let x = 10;

This line of code assign 10 to variables x .

Add and Assign (+=)

let x=10;

x+=10; 

console.log(x)  // output : 20

This is same as writing x=x+10;

Subtract and Assign (-=)

let x=20;

x-=10;

console.log(x) //output: 10

This is same as writing as x=x-10;

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📌 Wrapping Up

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