Selection in JavaScript Simplified Revision Notes for A-Level OCR Computer Science

Revision notes with simplified explanations to understand Selection in JavaScript quickly and effectively.

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Selection in JavaScript

Overview

Selection structures (conditionals) in JavaScript allow the code to make decisions based on conditions, using statements like if, else, and switch.

Key Concepts

if...else: Executes code based on a true or false condition.
switch statement: Useful for multiple conditions.

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Example:

let age = 18;
if (age >= 18) {
  console.log("You are an adult.");
} else {
  console.log("You are a minor.");
}

Common Mistakes

Incorrect syntax in conditions: Make sure conditions are properly formatted and closed.

infoNote

Key Takeaways

Selection structures control program flow based on conditions.
if...else and switch are the main selection statements.

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