Left Shift Assignment (<<=) Operator in JavaScript

The Left Shift Assignment Operator is represented by “<<=”. This operator moves the specified number of bits to the left and assigns that result to the variable. We can fill the vacated place by 0. The left shift operator treats the integer stored in the variable to the operator’s left as a 32-bit binary number. This can also be explained as the number is shifted to the left by the integer which is the right of the operator and assign the result to the variable.

Syntax

a <<= b
Or 
a = a << b

Where –

• a is the first operand, and
• b is the second operand.

Example 1: In this example, we will see the implementation of the left shift assignment.

Javascript

let x = 7; // 00000000000000000000000000000111

x <<= 2;   // 00000000000000000000000000011100

console.log(x);

Output

28

Example 2: In this example, we will see left shift operator is not used for the negative number.

Javascript

let x = 1; // 00000000000000000000000000000001
x <<= -1;  // -10000000000000000000000000000000

console.log(x);

Output

-2147483648

Example 3: In this example, we will see the implementation of the left shift assignment operator.

Javascript

let a = 10; // 00000000000000000000000000001010
let b = 5   // 00000000000000000000000000000101
a = a << b; // 00000000000000000000000101000000

console.log(a);

Output

320

We have a complete list of Javascript Assignment Operators, Please check this article Javascript Assignment Operator.

Supported Browser:

• Chrome 1
• Edge 12
• Firefox 1
• Opera 3
• Safari 1