Selection in JavaScript (OCR A-Level Computer Science): Revision Notes

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.

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.