JavaScript Switch

Choose between many cases.

✍️ 3 exercises + code challenge in this lesson

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A switch statement compares one value against many cases. It is often clearer than a long chain of else if.

Each case is compared with ===.
break stops the switch; without it, execution "falls through" to the next case.
default runs when no case matches.

Key Takeaways: JavaScript Switch

Mastering JavaScript Switch helps you write clean and reliable JavaScript code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

JavaScript Switch Code Example

JavaScript

<pre id="out"></pre>
<script>
const log = (...a) => document.getElementById("out").textContent += a.join(" ") + "\n";
const days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
const today = new Date().getDay();
let plan;

switch (today) {
  case 0:
  case 6:
    plan = "Weekend: time to relax!";
    break;
  case 5:
    plan = "Friday: almost there.";
    break;
  default:
    plan = "A working day: keep coding.";
}

log(days[today] + ":", plan);
</script>

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JavaScript Switch Practice Exercises

Check what you learned in “JavaScript Switch”.

/ 3 solved

Fill in the blank

Stop the switch after a match.

switch (day) {
  case 0:
    log("Sunday");
    ;
}

✓ Correct! Not quite. Try again.

Multiple choice

Which keyword runs when no case matches?

default else otherwise none

✓ Correct! Not quite. Try again.

Code challenge

Use a switch on color: log "Stop" for "red", "Go" for "green", otherwise "Wait".

Write the code in the live editor. Your answer is checked automatically.

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JavaScript Switch

💡 Key Takeaways: JavaScript Switch

JavaScript Switch Code Example

JavaScript Switch Practice Exercises

Key Takeaways: JavaScript Switch