Operator in JavaScript

This guide covers operator in JavaScript with practical context and easy-to-follow details. Use it to understand the subject and apply the information confidently.

1. Arithmetic operator
2. Comparison operator
3. Logical operators (or relations)
4. Assignment operator
5. Conditional operator

We now consider each operator one.

JavaScript supports the following arithmetic operators:

Assuming variable A holds value 10 and variable B holds value 20, then:

+ (Addition)

Add two operands

Ex: A + B will result in 30

- (Subtraction)

Subtract the second operand from the first operand.

Ex: A - B will result in -10

* (Multiplication)

Multiply two operands

Ex: A * B will result in 200

/ (Division)

Divide the divisor by the divided number

Ex: B / A will result in 2

% (Split division)

The result is the remainder of the division.

Ex: B% A will result in 0

++ (Increase to 1)

Increase integer value to 1

Ex: A ++ will result in 11

- (Reduced 1)

Reduce an integer value to one

Ex: A-- will result in 9

Note - The plus (+) operand works with numbers as well as strings, for example: "a" + 10 will result in "a10".

For example

The following code shows how to use arithmetic operators in JavaScript:

 Set the variables to different values and then try.

Result:

 a + b = 43 
 a - b = 23 
 a / b = 3.3 
 a% b = 3 
 a + b + c = 43Test 
 a ++ = 33 
 b-- = 10 
 Đặt biến vào các giá trị khác nhau và thử thử . 

JavaScript supports the following comparison operators:

Suppose variable A holds value 10 and variable B holds a value of 20, then:

= = (Equal)

Check if the value of the two operands is equal or not, if any, the condition becomes true.

Ex: (A == B) is not true.

! = (Unbalanced)

Check if the value of the two operands is balanced or not, otherwise the condition becomes true.

Ex: (A! = B) is true.

> (Larger)

Check if the value of the left operand is greater than the right operand, if any, the condition becomes true.

Ex: (A> B) is not true.

<(Smaller)

Check if the value of the left operand is less than the right operand, if any, the condition becomes true.