JavaScript Introduction | Operators | Arithmetic Operators

Arithmetic Operators

Arithmetic operators are the most basic and frequently used operators for handling the four arithmetic operations.
All arithmetic operators are binary operators with two operands, and their associativity is from left to right.

Arithmetic Operator	Description
+	Adds the value of the right operand to the value of the left operand.
-	Subtracts the value of the right operand from the value of the left operand.
*	Multiplies the value of the left operand by the value of the right operand.
/	Divides the value of the left operand by the value of the right operand.
%	Divides the value of the left operand by the value of the right operand and returns the remainder.

var x = 10, y = 4;
document.write(x + y + "<br>"); // 14
document.write(x - y + "<br>"); // 6
document.write(x * y + "<br>"); // 40
document.write(x / y + "<br>"); // 2.5
document.write(x % y);          // 2

JavaScript Operator Precedence Table

In JavaScript, operator precedence and associativity are as follows.

Precedence	Operator	Description	Associativity
1	()	Grouping (parentheses)	-
2	.	Member access	left to right
	new	Object creation with arguments	-
3	()	Function call	left to right
	new	Object creation without arguments	right to left
4	++	Postfix increment operator	-
	–	Postfix decrement operator	-
5	!	Logical NOT operator	right to left
	~	Bitwise NOT operator	right to left
	+	Positive sign (unary operator)	right to left
	-	Negative sign (unary operator)	right to left
	++	Prefix increment operator	right to left
	–	Prefix decrement operator	right to left
	typeof	Type return	right to left
	void	Return undefined	right to left
	delete	Remove a property	right to left
6	**	Exponentiation operator	right to left
	*	Multiplication operator	left to right
	/	Division operator	left to right
	%	Remainder operator	left to right
7	+	Addition operator (binary operator)	left to right
	-	Subtraction operator (binary operator)	left to right
8	«	Bitwise left shift operator	left to right
	»	Bitwise right shift with sign extension	left to right
	»>	Bitwise right shift without sign extension	left to right
9	<	Relational operator (less than)	left to right
	<=	Relational operator (less than or equal to)	left to right
	>	Relational operator (greater than)	left to right
	>=	Relational operator (greater than or equal to)	left to right
	instanceof	Determines whether a value is an instance	left to right
10	==	Equality operator	left to right
	===	Strict equality operator	left to right
	!=	Inequality operator	left to right
	!==	Strict inequality operator	left to right
11	&	Bitwise AND operator	left to right
12	^	Bitwise XOR operator	left to right
13	\|	Bitwise OR operator	left to right
14	&&	Logical AND operator	left to right
15	\|\|	Logical OR operator	left to right
16	? :	Ternary operator	right to left
17	=	Assignment operator (=, +=, -=, *=, /=, %=, «=, »=, »>=, &=, ^=, \|=)	right to left
18	…	Spread	-
19	,	Comma operator	left to right

Operators with higher precedence in the table above are executed first.
When two or more operators have the same precedence, the execution order is determined by associativity.