Course Content

Introduction to JavaScript

1. JavaScript Fundamentals

About JavaScript Understanding JavaScript Syntax Challenge: Console Output in JavaScript Using Comments to Document Code Challenge: Write a Single-Line Comment Challenge: Write a Multi-Line Comment

2. Variables and Data Types in JavaScript

Understanding Variables in JavaScript Challenge: Define the Variable Using const for Constants Exploring JavaScript Data Types Working with null in JavaScript Introduction to Arrays Array Methods and Manipulation Challenge: Perform Array Operations

3. Performing Operations in JavaScript

Understanding Assignment Operators Mathematical Operations in JavaScript Assignment Operators in JavaScript Increment and Decrement Operators Challenge: Variable Operations Practice Comparison Operators in JavaScript Logical Operators Explained Challenge: Compare Variables in JavaScript Concatenating Strings in JavaScript Challenge: Build Sentences with JavaScript

4. Controlling Program Flow with Conditional Statements

Mastering if Statements in JavaScript Using else for Alternative Outcomes Applying else if for Multiple Conditions Challenge: Determine Sizes with Conditionals

5. Looping Through Data in JavaScript

Understanding the while Loop in JavaScript Using the do while Loop for Iteration Challenge: Print Numbers from 5 to 9 Mastering the for Loop in JavaScript Challenge: Console Tigers with Loops Breaking Out of Loops with break Skipping Iterations with continue Challenge: Stop and Skip in Loops

6. Functions in JavaScript

What Are Functions in JavaScript?Defining Functions in JavaScript Challenge: Write a Function – My Name Using Function Arguments Effectively Returning Values from Functions Challenge: Create a Sum Function Course Summary & Next Steps

Returning Values from Functions

The primary purpose of a function is to return a value.

The function's space is deleted after its execution, and you rarely output information directly from the function to the console.

The return keyword is used to perform the value return operation, and it signifies the end of the function's execution:


              1234567
            
function add(a, b) {
  return a + b;
}

let sum = add(25, 30);

console.log("sum =", sum);

In the example above, you can see that the function call (add(25, 30)) is replaced by the value 55 (25 + 30) after the return keyword.

Note

The function completes its execution and returns a value at the point of call, and the function's space is cleared.

It's also essential to understand that the return keyword terminates the execution of the function. Any code after the return statement will not be executed:


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function add(a, b) {
  return a + b;
  console.log("Two numbers added");
  console.log("Two numbers added");
  console.log("Two numbers added");
  console.log("Two numbers added");
}

let numb = add(25, 12);

console.log("numb =", numb);

The console.log() statements after the return statement were not executed.

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Section 6. Chapter 5

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