Operators in JavaScript

The different type of operators in JavaScript. Operators are symbols used to perform different operations.

    * Addition Operator
    * Assignment Operator
    * Addition Assignment Operator
    * Subtraction Operator
    * Subtraction Assignment Operator
    * Multiplication Operator
    * Division Operator

1. Addition Operator (+)

The + operator is used to add two numbers.

let a = 10;
let b = 5;

console.log(a + b);

Output:

15

2. Assignment Operator (=)

The = operator is used to assign a value to a variable.

let number = 10;

console.log(number);

Output:

10

Here, 10 is assigned to number.

3. Addition Assignment Operator (+=)

The += operator adds a value to the existing value.

let number = 10;

number += 5;

console.log(number);

Output:

15

It is the same as:

number = number + 5;

In my calculator, += is also used to add a new digit to the existing value.

currentValue += value;

If currentValue is "10" and value is "5", the output becomes "105" because they are strings.

4. Subtraction Operator (-)

The - operator is used to subtract one number from another.

let a = 10;
let b = 5;

console.log(a - b);

Output:

5

5. Subtraction Assignment Operator (-=)

The -= operator subtracts a value from the existing value.

let number = 10;

number -= 5;

console.log(number);

Output:

5

It is the same as:

number = number - 5;

6. Multiplication Operator (*)

The * operator is used to multiply two numbers.

let a = 10;
let b = 5;

console.log(a * b);

Output:

50

7. Division Operator (/)

The / operator is used to divide one number by another.

let a = 10;
let b = 5;

console.log(a / b);

Output:

2

*Comparison Operators

• Comparison operators are used to compare two values.

• They return either true or false.

• means more than and < means less than.

  • == checks whether two values are equal.
  • === checks both value and data type.

Example:
let a = 10;
let b = 5;

console.log(a > b); // true
console.log(a < b); // false
console.log(a == 10); // true
console.log(a === 10); // true

output:

true
false
true
true

• Logical Operators

• Logical operators are used to combine two or more conditions.

• && means AND and checks if all conditions are true.

• || means OR and checks if at least one condition is true.

• ! means NOT and changes true to false or false to true.

• Logical operators are commonly used with if conditions.

Example:

&& AND Operator

The && operator checks whether both conditions are true.

Example:

let age = 20;

console.log(age > 18 && age < 30);

Output:

true

• OR Operator

The || operator checks whether at least one condition is true.

Example:

let age = 20;

console.log(age > 18 || age < 10);

Output:

true

• ! NOT Operator

The ! operator changes true to false and false to true.

Example :

let age = 20;

console.log(!(age > 18));

Output:

false

Increment and Decrement Operators

• The ++ operator increases a value by 1.

• The -- operator decreases a value by 1.

• These operators are used to increase or decrease a variable.

• They are commonly used in loops and calculations.

• The value changes directly when the operator is used.

Example :

let number = 10;

number++;
console.log(number);

number--;
console.log(number);

Output:
11
10

Modulus Operator (%)

• The % operator is used to find the remainder after division.
• It gives the remaining value after one number is divided by another.

Example:

let a = 10;
let b = 3;

console.log(a % b);

Output:

1

Exponentiation Operator (**)

The ** operator is used to calculate the power of a number.

It raises the first number to the power of the second number.

For example, 2 ** 3 means 2 × 2 × 2.

The result is 8.

It is also called the power operator.

Example :

let a = 2;
let b = 3;
console.log(a ** b);

output:

8

Not Equal Operator (!=)

• The != operator checks whether two values are not equal.

• If the values are different, it returns true.

• If the values are the same, it returns false.

• It checks the value but does not strictly check the data type.

• It is used to compare two different values.

Example:

let a = 10;
let b = 5;

console.log(a != b);

output :

true

Strict Not Equal Operator (!==)

• The !== operator checks whether two values are not equal.

  • It checks both the value and data type.

• If either the value or data type is different, it returns true.

  • If both are the same, it returns false.

• It is called the Strict Not Equal Operator.

Example:
let a = 10;
let b = "10";

console.log(a !== b);

Output:

true

10 is a number and "10" is a string.