JavaScript - If...Else

Overview

Estimated time: 25–35 minutes

Control flow with if/else. Learn chained conditions and the ternary operator.

Learning Objectives

• Write conditional logic using if/else if/else.
• Use the ternary operator for simple expressions.

Prerequisites

• JavaScript - Operator Precedence

Examples

const x = 5;
if (x > 10) {
  // ...
} else if (x > 0) {
  // ...
} else {
  // ...
}

const y = (x > 0 ? 1 : -1);

Common Pitfalls

• Using assignment (=) instead of comparison (===) in conditions.

Exercises

1. Write a function that classifies an integer as negative, zero, or positive.