Learn about JavaScript FUNCTIONS

Lesson Plan: Introduction to JavaScript Functions

Lesson Objectives:

By the end of this lesson, students will be able to:

1. Understand what a function is in JavaScript.
2. Know how to create and call functions.
3. Use JavaScript built-in functions such as alert().
4. Pass arguments to functions.
5. Understand the difference between arguments and parameters.

Key Concepts:

• JavaScript Function: A block of reusable code that performs a specific task.
• Function Definition: Consists of the function keyword, a name, parentheses (for arguments), and curly braces for the code block.
• Calling a Function: The process of executing the code inside a function.
• Arguments: Values passed to functions for it to operate on.
• Built-in Functions: Predefined JavaScript functions such as alert().

Introduction to Functions:

1. Defining Functions

• Explain that a function is a reusable block of code that performs a specific task.
• Example:

• Explain how this function, when called, will trigger a popup with “Password!” message.

2. Calling Functions

• A function must be called in order to execute.
• Example:

3. Function Structure:

• A function needs:
  1. The function keyword: To define the function.
  2. A name: Helps describe what the function does (e.g., sayPassword()).
  3. Curly braces : To enclose the code block.
  4. Statements: The actual task the function performs (in this case, the alert).
  5. Function call: To invoke the function.

JavaScript Built-in Functions:

• JavaScript comes with built-in functions like alert(). This saves time since the work is already done for you.

Example:

Passing Arguments to Functions:

1. Introduction to Arguments

• Arguments are values we pass to functions to perform specific tasks.
• The alert() function requires an argument to know what message to display.

Example: