JavaScript Assignment Operators
Assignment operators assign values to JavaScript variables.
= | x = y | x = y |
+= | x += y | x = x + y |
-= | x -= y | x = x - y |
*= | x *= y | x = x * y |
/= | x /= y | x = x / y |
%= | x %= y | x = x % y |
**= | x **= y | x = x ** y |
The **=
operator is a part of ECMAScript 2016.
It does not work in Internet Explorer 11 or earlier.
Shift Assignment Operators
> y | ||
>>>= | x >>>= y | x = x >>> y |
Logical Assignment Operators
&= | x &= y | x = x & y |
^= | x ^= y | x = x ^ y |
|= | x |= y | x = x | y |
The = Operator
The =
assignment operator assigns a value to a variable.
The += Operator
The +=
assignment operator adds a value to a variable.
The -= Operator
The -=
assignment operator subtracts a value from a variable.
The *= Operator
The *=
assignment operator multiplies a variable.
The /= Operator
The /=
assignment divides a variable.
The %= Operator
The %=
assignment operator assigns a remainder to a variable.
The = assignment operator right shifts a variable [signed].The >>>= Operator
The >>>=
assignment operator right shifts a variable [unsigned].
The &= Operator
The &=
assignment operator ANDs a variable.
The != Operator
The !=
assignment operator ORs a variable.
Test Yourself With Exercises
Exercise:
Use the correct assignment operator that will result in x
being 15
[same as x = x + y
].
Start the Exercise
The simple assignment operator [=
] is used to assign a value to a variable. The assignment operation evaluates to the assigned value. Chaining the assignment operator is possible in order to assign a single value to multiple variables. Try it
Syntax
Examples
Simple assignment and
chaining
// Assuming the following variables
// x = 5
// y = 10
// z = 25
x = y // x is 10
x = y = z // x, y and z are all 25
Specifications
ECMAScript Language Specification # sec-assignment-operators |
Browser compatibility
BCD tables only load in the browser
See also
The Assignment operator is equal [=] which assigns the value of right-hand operand to its left-hand operand. That is if a = b assigns the value of b to a.
The simple assignment operator is used to assigning a value to a variable. The assignment operation evaluates to the assigned value. Chaining the assignment operator is possible in order to assign a single value to multiple variables. See the example.
Syntax:
data=value
Examples:
// Lets take some variables x=10 y=20 x=y // Here, x is equal to 20 y=x // Here, y is equal to 10
There are so many assignment operator as shown in the table with the description:th
Addition Assignment | a+=b | a=a+b |
Subtraction Assignment | a-=b | a=a-b |
Multiplication Assignment | a*=b | a=a*b |
Division Assignment | a/=b | a=a/b |
Remainder Assignment | a%=b | a=a%b |
Exponentiation Assignment | a**=b | a=a**b |
Left Shift Assignment | ab | |
Bitwise AND Assignment | a&=b | a=a&b |
Bitwise OR Assignment | a|=b | a=a | b |
Bitwise XOR Assignment | a^=b | a=a^b |
Addition Assignment: This operator adds the value to the right operand to a variable and assigns the result to the variable. The types of the two operands determine the behavior of the addition assignment operator. Addition or concatenation is possible. In case if concatenation then we use the string as an operand.
Example:
Javascript
let a = 2;
const b= 3;
document.write[a];
document.write[
''
];
document.write[a = b + 1];
Output:
2 4
Subtraction Assignment: This operator subtracts the value of the right operand from a variable and assigns the result to the variable.
Example:
Javascript
let yoo=4;
document.write[foo=yoo-1];
Output:
3
Multiplication Assignment: This operator multiplies a variable by the value of the right operand and assigns the result to the variable.
Example:
Javascript
let yoo=5;
document.write[yoo=yoo*2];
Output:
10
Division Assignment: This operator divides a variable by the value of the right operand and assigns the result to the variable.
Example:
Javascript
let yoo=10;
const moo=2;
document.write[yoo=yoo/moo];
document.write[
""
];
document.write[yoo/=0];
Output:
5 Infinity
Remainder Assignment: This operator divides a variable by the value of the right operand and assigns the remainder to the variable.
Example:
Javascript
let yoo=50;
document.write[yoo%=10];
Output:
0
Exponentiation Assignment: This operator raises the value of a variable to the power of the right operand.
Example:
Javascript
let yoo=2;
const moo=2;
document.write[yoo**moo];
Output:
4
Left Shift Assignment: This operator moves the specified amount of bits to the left and assigns the result to the variable.
Example:
Javascript
var
yoo=5;
document.write[yoo=2];
Output:
1
Binary AND Assignment: This operator uses the binary representation of both operands, does a bitwise AND operation on them, and assigns the result to the variable.
Example:
Javascript
var
yoo=5;
document.write[yoo&=2];
Output:
0
Binary OR Assignment: This operator uses the binary representation of both operands, does a bitwise OR operation on them, and assigns the result to the variable.
Example:
Javascript
var
yoo=5;
document.write[yoo|=2];
Output:
7
This operator uses the binary representation of both operands, does a bitwise XOR operation on them, and assigns the result to the variable.
Example:
Javascript
var
yoo=5;
document.write[yoo^=2];
Output:
7