Functions & Procedures in JavaScript Simplified Revision Notes for A-Level OCR Computer Science

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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.

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Example:

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.

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Key Takeaways

Functions are central to code reusability in JavaScript.
Learn to define, call, and return values from functions.

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