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Lesson 3: Operators and Expressions

Objectives:

• Understand and use arithmetic operators in JavaScript.
• Learn how to compare values using comparison operators.
• Explore logical operators and their applications.
• Master the conditional (ternary) operator for concise decision-making.

1. Arithmetic Operators

1.1 Addition (+)

Example:

let sum = 3 + 5; // sum is now 8

1.2 Subtraction (-)

Example:

let difference = 10 - 7; // difference is now 3

1.3 Multiplication (*)

Example:

let product = 4 * 6; // product is now 24

1.4 Division (/)

Example:

let quotient = 15 / 3; // quotient is now 5

1.5 Modulus (%)

Example:

let remainder = 17 % 5; // remainder is now 2

2. Comparison Operators

2.1 Equal to (==)

Example:

let isEqual = (10 == '10'); // isEqual is true

2.2 Strict Equal to (===)

Example:

let isStrictEqual = (10 === '10'); // isStrictEqual is false

2.3 Not Equal to (!=)

Example:

let isNotEqual = (5 != '5'); // isNotEqual is false

2.4 Greater than (>)

Example:

let isGreaterThan = (15 > 10); // isGreaterThan is true

2.5 Less than (<)

Example:

let isLessThan = (3 < 8); // isLessThan is true

3. Logical Operators

3.1 AND (&&)

Example:

let isBothTrue = (true && true); // isBothTrue is true

3.2 OR (||)

Example:

let isEitherTrue = (true || false); // isEitherTrue is true

3.3 NOT (!)

Example:

let isNotTrue = !true; // isNotTrue is false

4. Conditional (Ternary) Operator

Syntax:

condition ? expression_if_true : expression_if_false;

Example:

let age = 20;
let canVote = (age >= 18) ? "Yes" : "No";
// canVote is now "Yes"

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