Control Flow If Else and Switch

Continue your JavaScript Tutorial learning path with hands-on explanation, code practice, and quiz.

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Course

JavaScript Tutorial

Estimated Time

8 min

Progress

Track Position

4 / 73

Lesson Overview

Simple Explanation

if, else if, else multiple conditions handle karte hain. switch fixed values ke against clean branching deta hai.

Code Explanation

Grade value ke basis par switch different messages show karta hai.

Output Description

Input ke mutabiq message print hoga.

Practice Exercise

Traffic light color ke liye switch banao: red stop, yellow wait, green go.

Extra Explanation

Why This Matters

Control Flow If Else and Switch is core to dynamic behavior. Strong fundamentals here help you build forms, API flows, and interactive UI with confidence.

Real-World Workflow

Complex features are usually split into small functions, then verified through focused logging and tiny test cases.

Common Mistakes to Avoid

Avoid uncontrolled globals, weak error handling, and ignored async states. Define clear input-output expectations for each function.

Example + Live Practice

<script>
  const marks = 78;

  if (marks >= 80) {
    console.log("A grade");
  } else if (marks >= 60) {
    console.log("B grade");
  } else {
    console.log("Needs improvement");
  }

  const day = 2;
  switch (day) {
    case 1: console.log("Monday"); break;
    case 2: console.log("Tuesday"); break;
    default: console.log("Other day");
  }
</script>

Try It Yourself

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