📝 Assignment & Compound Operators in JavaScript

Last Updated: 11th Oct 2025

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📌 What is Assignment (=)?

• The assignment operator (=) is used to store a value in a variable.
• It assigns the value on the right side to the variable on the left side.

Hinglish Tip 🗣: = ka matlab hai “value ko variable ke andar daal do” — jaise x = 10 matlab x ke andar 10 store ho gaya.

Example:

let x = 10; // x holds 10
let y = 5; // y holds 5

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📌 Compound Operator

Compound assignment operators combine an operation and assignment in one step.

• Instead of writing x = x + 5, you can write x += 5.
• They work for arithmetic and bitwise operations.

Hinglish Tip 🗣: x += 5 ek chhota shortcut hai x = x + 5 ka.

Operator	Meaning	Equivalent Long Form
=	Assign	x = 10
+=	Add and assign	x += 5 → x = x + 5
-=	Subtract and assign	x -= 3 → x = x - 3
*=	Multiply and assign	x *= 2 → x = x * 2
/=	Divide and assign (float result)	x /= 4 → x = x / 4
%=	Modulus and assign	x %= 3 → x = x % 3
**=	Power and assign	x **= 2 → x = x ** 2
&=	Bitwise AND and assign	x &= 3 → x = x & 3
|=	Bitwise OR and assign	x |= 2 → x = x | 2
^=	Bitwise XOR and assign	x ^= 4 → x = x ^ 4
<<=	Left shift and assign	x <<= 1 → x = x << 1
>>=	Right shift and assign	x >>= 2 → x = x >> 2

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Example

let x = 10;

x += 5; // x = x + 5
console.log(x); // 15

x -= 3; // x = x - 3
console.log(x); // 12

x *= 2; // x = x * 2
console.log(x); // 24

x /= 4; // x = x / 4
console.log(x); // 6

x **= 2; // x = x ** 2
console.log(x); // 36

let x = 10; // binary: 1010
x &= 6; // 1010 & 0110 = 0010 (2)
console.log(x); // 2

x |= 4; // 0010 | 0100 = 0110 (6)
console.log(x); // 6

x ^= 3; // 0110 ^ 0011 = 0101 (5)
console.log(x); // 5

💡 Tip: Compound operators save time and reduce typing. You’ll use them a lot in loops, counters, and calculations .Don’t worry! For Bitwise Operator ,We will cover in upcoming section.

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💡 Quick Practice

1. Create a variable count = 10 → add 5 using +=
2. Subtract 2 using -= and print result
3. Multiply by 3 using *=
4. Divide by 2 using /=
5. Print each result step-by-step in console

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