Functions & Procedures in JavaScript (OCR A-Level Computer Science): Revision Notes

Functions & Procedures in JavaScript

Overview

Functions and procedures in JavaScript encapsulate reusable code. Functions can accept inputs, process them, and return outputs, while procedures simply execute code.

Key Concepts

• Defining Functions: function myFunction() { }
• Parameters and Return Values: Functions can take parameters and return results.

function add(a, b) {
  return a + b;
}
console.log(add(5, 3)); // Outputs 8

Common Mistakes

• Not using return in functions: Functions without return will return undefined.