Last Updated : 28 Jul, 2025
Assignment operators are used to assign values to variables in JavaScript.
JavaScript
// Lets take some variables
x = 10
y = 20
x = y ;
console.log(x);
console.log(y);
More Assignment Operators
There are so many assignment operators as shown in the table with the description.
Addition Assignment Operator(+=)The Addition assignment operator adds the value to the right operand to a variable and assigns the result to the variable. Addition or concatenation is possible. In case of concatenation then we use the string as an operand.
Example:
JavaScript
let a = 2;
const b = 3;
// Expected output: 2
console.log(a);
// Expected output: 4
console.log(a += b );
Subtraction Assignment Operator(-=)
The Substraction Assignment Operator subtracts the value of the right operand from a variable and assigns the result to the variable.
Example:
JavaScript
let yoo = 4;
// Expected output 3
console.log(yoo -= 1);
Multiplication Assignment Operator(*=)
The Multiplication Assignment operator multiplies a variable by the value of the right operand and assigns the result to the variable.
Example:
JavaScript
let yooMul = 4;
// Expected output 3
console.log(yooMul *= 2);
Division Assignment Operator(/=)
The Division Assignment operator divides a variable by the value of the right operand and assigns the result to the variable.
Example:
JavaScript
let yooDiv = 10;
const moo = 2;
console.log(yooDiv /= moo);
console.log(yooDiv /= 0);
Remainder Assignment Operator(%=)
The Remainder Assignment Operator divides a variable by the value of the right operand and assigns the remainder to the variable.
Example:
JavaScript
let yooRem = 50;
console.log(yooRem %= 10);
Exponentiation Assignment Operator
The Exponentiation Assignment Operator raises the value of a variable to the power of the right operand.
Example:
JavaScript
let yooExp = 2;
console.log(yooExp **= 3);
Left Shift Assignment Operator(<<=)
This Left Shift Assignment Operator moves the specified amount of bits to the left and assigns the result to the variable.
Example:
JavaScript
let yooShiftLeft = 5;
console.log(yooShiftLeft <<= 2);
Right Shift Assignment Operator(>>=)
The Right Shift Assignment Operator moves the specified amount of bits to the right and assigns the result to the variable.
Example:
JavaScript
let yooShiftRight = 5;
console.log(yooShiftRight >>= 2);
Bitwise AND Assignment Operator(&=)
The Bitwise AND Assignment Operator uses the binary representation of both operands, does a bitwise AND operation on them, and assigns the result to the variable.
Example:
JavaScript
let yooBitwiseAnd = 5;
console.log(yooBitwiseAnd &= 2);
Btwise OR Assignment Operator(|=)
The Btwise OR Assignment Operator uses the binary representation of both operands, does a bitwise OR operation on them, and assigns the result to the variable.
Example:
JavaScript
let yooBitwiseOr = 5;
console.log(yooBitwiseOr |= 2);
Bitwise XOR Assignment Operator(^=)
The Bitwise XOR Assignment Operator uses the binary representation of both operands, does a bitwise XOR operation on them, and assigns the result to the variable.
Example:
JavaScript
let yooBitwiseXor = 5;
console.log(yooBitwiseXor ^= 2);
Logical AND Assignment Operator(&&=)
The Logical AND Assignment assigns the value of y into x only if x is a truthy value.
Example:
JavaScript
let name = { firstName: "Ram", lastName: "" };
console.log(name.firstName);
name.firstName &&= "Shyam";
console.log(name.firstName);
console.log(name.lastName);
name.lastName &&= "Kumar";
console.log(name.lastName);
Logical OR Assignment Operator(||=)
The Logical OR Assignment Operator is used to assign the value of y to x if the value of x is falsy.
Example:
JavaScript
let nameOr = { firstName: "Ram", lastName: "" };
console.log(nameOr.firstName);
nameOr.firstName ||= "Shyam";
console.log(nameOr.firstName);
console.log(nameOr.lastName);
nameOr.lastName ||= "Kumar";
console.log(nameOr.lastName);
Nullish coalescing Assignment Operator(??=)
The Nullish coalescing Assignment Operator assigns the value of y to x if the value of x is null.
Example:
JavaScript
let xNull = 12;
let yNull = null;
let zNull = 13;
xNull ??= zNull;
yNull ??= zNull;
console.log(xNull);
console.log(yNull);
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