Скачать или смотреть JavaScript Operators and Expressions

Operators perform actions on values/variables. An expression is a combination of operators, values, and variables that returns a result.

1️⃣ Arithmetic Operators

Addition → 5 + 3 = 8

Subtraction → 5 - 2 = 3

Multiplication → 4 * 2 = 8

/ Division → 10 / 2 = 5

% Modulus (remainder) → 7 % 2 = 1

** Exponentiation → 2 ** 3 = 8

++ Increment → let a=5; a++; // 6

-- Decrement → let b=5; b--; // 4

2️⃣ Assignment Operators

= → x = 10

+= → x += 5 → x = x + 5

-= → x -= 2 → x = x - 2

*= → x *= 3 → x = x * 3

/= → x /= 2 → x = x / 2

%= → x %= 2 → x = x % 2

**= → x **= 2 → x = x ** 2

3️⃣ Comparison Operators

== Equal (value only) → 5 == "5" // true

=== Strict Equal (value + type) → 5 === "5" // false

!= Not Equal (value only)

!== Strict Not Equal (value + type)
Less than
Greater than or equal to
Less than or equal to


👉 Best practice: use === and !== for accurate checks.

4️⃣ Logical Operators

&& AND → true if both are true

|| OR → true if one is true

! NOT → reverses result