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JavaScript Arithmetic


JavaScript Arithmetic Operators
Arithmetic operators perform arithmetic on numbers (literals or variables).


Operator
Description


+
Addition


-
Subtraction


*
Multiplication


**
Exponentiation (ES2016)


/
Division


%
Modulus (Remainder)


++
Increment


--
Decrement



Arithmetic Operations
A typical arithmetic operation operates on two numbers.
The two numbers can be literals:

Example

let x = 100 + 50;

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or variables:

Example

let x = a + b;

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or expressions:

Example

let x = (100 + 50) * a;

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Operators and Operands
The numbers (in an arithmetic operation) are called operands.
The operation (to be performed between the two operands) is defined by an operator.


Operand
Operator
Operand


100
+
50









Adding
The addition operator (+) adds numbers:

Example

let x = 5;
let y = 2;
let z = x + y;

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Subtracting
The subtraction operator (-) subtracts numbers.

Example

let x = 5;
let y = 2;
let z = x - y;

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Multiplying
The multiplication operator (*) multiplies numbers.

Example

let x = 5;
let y = 2;
let z = x * y;

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Dividing
The division operator (/) divides numbers.

Example

let x = 5;
let y = 2;
let z = x / y;

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Remainder
The modulus operator (%) returns the division remainder.

Example

let x = 5;
let y = 2;
let z = x % y;

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In arithmetic, the division of two integers produces a quotient
and a remainder.
In mathematics, the result of a modulo operation is the remainder of an arithmetic division.



Incrementing
The increment operator (++) increments numbers.

Example

let x = 5;x++;
let z = x;
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Decrementing
The decrement operator (--) decrements numbers.

Example

let x = 5;
x--;
let z = x;

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Exponentiation
The exponentiation operator (**) raises the first operand to the power of the second operand.

Example

let x = 5;
let z =
x ** 2;

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x ** y produces the same result as Math.pow(x,y):

Example

let x = 5;
let z =
Math.pow(x,2);

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Operator Precedence
Operator precedence describes the order in which operations are performed in
an arithmetic expression.

Example

let x = 100 + 50 * 3;

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Is the result of example above the same as 150 * 3, or is it the same as 100
+ 150?
Is the addition or the multiplication done first?
As in traditional school mathematics, the multiplication is done first.
Multiplication (*) and division (/) have higher precedence than
addition (+) and subtraction (-).
And (as in school mathematics) the precedence can be changed by using
parentheses.
When using parentheses, the operations inside the parentheses are computed
first:

Example

let x = (100 + 50) * 3;

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When many operations have the same precedence (like addition and
subtraction or multiplication and division), they are computed from left to
right:

Examples

let x = 100 + 50 - 3;

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let x = 100 / 50 * 3;

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Note
For a full list of operator precedence values go to:
JavaScript Operator Precedence Values.



Test Yourself With Exercises

Exercise:
Divide 10 by 2, and alert the result.


alert(10 2);



Submit Answer »
Start the Exercise














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Reference: https://www.w3schools.com/js/js_arithmetic.asp