JavaScript Function Examples: Code Snippets for Grade 8

📚 Quick Study Guide

• 💡 A JavaScript function is a block of code designed to perform a particular task.
• ✍️ Functions are defined using the `function` keyword, followed by a name, parentheses `()`, and curly braces `{}`.
• ➡️ The code inside the curly braces `{}` is executed when the function is "called" or "invoked".
• 🔢 Functions can take parameters (inputs) inside the parentheses `()`. These parameters act as variables inside the function.
• ↩️ Functions can return a value using the `return` statement.
• ➕ Example: `function add(a, b) { return a + b; }`
• 🚀 To use a function, you call it by its name followed by parentheses: `add(5, 3);`

🧪 Practice Quiz

1. What keyword is used to define a function in JavaScript?
   1. void
   2. func
   3. function
   4. def
2. Which of the following is the correct way to call a function named `greet`?
   1. greet;
   2. call greet();
   3. greet();
   4. function greet();
3. What are the inputs to a function called?
   1. Arguments
   2. Variables
   3. Parameters
   4. Inputs
4. What does a function do?
   1. Displays a webpage
   2. Performs a specific task
   3. Connects to the internet
   4. Stores data
5. Which symbol is used to enclose the code block of a function?
   1. ()
   2. []
   3. {}
   4. <>
6. What statement is used to send a value back from a function?
   1. send
   2. give
   3. return
   4. output
7. If a function does not have a `return` statement, what does it return by default?
   1. 0
   2. 1
   3. null
   4. undefined