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

Using else for Alternative Outcomes

While if statements execute code under specific conditions, they don't create true branching in your code. Instead, they guide the interpreter through different paths within your program.

The else Keyword

To introduce branching behavior, you can use the else keyword in combination with if to create conditional statements.

Consider this example:


              1234567
            
let a = 60;

if (a >= 100) {
  console.log("a is greater than or equal to 100");
} else {
  console.log("a is less than 100");
}

In the example above, the condition a >= 100 evaluates to false, so the code block within the if statement is not executed. Instead, the code block within the else statement is executed because the if condition is false.

The syntax of the else statement is similar to that of the if statement, except it doesn't require a condition or parentheses ().

Note

When using an else statement, do not place the end-of-command (;) after the if code block ({}), as this will result in a SyntaxError. The if-else statement is considered a single command.

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Section 4. Chapter 2

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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

3. Performing Operations in 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

6. Functions in JavaScript

Using else for Alternative Outcomes

While if statements execute code under specific conditions, they don't create true branching in your code. Instead, they guide the interpreter through different paths within your program.

The else Keyword

To introduce branching behavior, you can use the else keyword in combination with if to create conditional statements.

Consider this example:


              1234567
            
let a = 60;

if (a >= 100) {
  console.log("a is greater than or equal to 100");
} else {
  console.log("a is less than 100");
}

The syntax of the else statement is similar to that of the if statement, except it doesn't require a condition or parentheses ().

Note

When using an else statement, do not place the end-of-command (;) after the if code block ({}), as this will result in a SyntaxError. The if-else statement is considered a single command.

Everything was clear?

Thanks for your feedback!

Section 4. Chapter 2

Introduction to JavaScript

Using else for Alternative Outcomes

The else Keyword

1. What will be the output?

2. What will be the output?

Introduction to JavaScript

Using else for Alternative Outcomes

The else Keyword

1. What will be the output?

2. What will be the output?