JavaScript Operators

Operators do work on values. For example + adds two numbers.

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Arithmetic operators

Operator	Meaning	Example
+	Add	5 + 2 is 7
-	Subtract	5 - 2 is 3
*	Multiply	5 * 2 is 10
/	Divide	5 / 2 is 2.5
%	Remainder	5 % 2 is 1
**	Power	2 ** 3 is 8
++, --	Add or subtract 1	x++

let a = 10, b = 3;
console.log(a + b);
console.log(a / b);
console.log(a % b);
console.log(a ** b);
let x = 5;
x++;
console.log(x);

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Assignment operators

let n = 10;
n += 5;   // n = n + 5
n *= 2;   // n = n * 2
console.log(n);

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Comparison operators

Operator	Meaning
===	Equal value and type
!==	Not equal
>, <	Greater, less
>=, <=	Greater or equal, less or equal

console.log(5 === 5);
console.log(5 !== "5");
console.log(7 > 3);

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Logical operators

Operator	Meaning
&&	AND: true only if both are true
||	OR: true if at least one is true
!	NOT: reverses true and false

let age = 25;
let hasId = true;
console.log(age >= 18 && hasId);
console.log(age < 18 || hasId);
console.log(!hasId);

|| and && return one of their values, which is often used to set a default.

let name = "" || "Guest";
console.log(name);
console.log(0 ?? 5);   // ?? only checks null and undefined
console.log(0 || 5);

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Ternary operator

A short way to write if and else: condition ? valueIfTrue : valueIfFalse.

let marks = 60;
let result = marks >= 40 ? "Pass" : "Fail";
console.log(result);

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Summary

• Arithmetic: + - * / % **.
• Compare with === and !==.
• Combine conditions with &&, || and !.
• Use ?? for defaults and ? : for short if/else.
• Next: JavaScript Strings.

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Exercises & Assignments
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