Kursusindhold

Introduction to JavaScript

1. Getting Started

First Javascript Console Application Challenge: Showing some Output Challenge: Outputing Multiple Lines Dealing with Numbers Challenge: Working with Numbers Challenge: Calculating the Speed of a Car Challenge: Calculating Area of a Trapezium Outputting Multiple Values Challenge: Consoling Meaningful Output How to Use Comments in Javascript?Challenge: Adding a Comment Multi-Line Comments Challenge: Commenting out Code What Is JavaScript anyway?

2. Manipulating Data

Storing Data Challenge: Declaring a Variable Challenge: Accessing Data From a Variable Challenge: Fixing Variable Names Challenge: Reassigning a Variable Constants Challenge: Declaring & Using Constants Performing Arithmetic On Variables Challenge: Making a Salary Calculator Challenge: Adjusting Salary with a Bonus Exploring Primitive Data Types Challenge: Declaring a Boolean Value How different Data Types Interact Challenge: Concatenating Strings Challenge: Creating User Profile & Activity Details

3. Conditional Statements

Comparison Operators Challenge: Checking Age Eligibility The `if` Statement Challenge: Weather-Based Outfit Recommender Challenge: Even or Odd Nested Conditional Statements The `else` Clause Challenge: Improving Even or Odd Checker Challenge: Temperature Advisor The `else if` Clause Challenge: Grade Categorizer ` AND` Logical Operator Challenge: Checking if a Number is Even and Positive OR Logical Operator Challenge: Accessing Control System

4. Mastering Functions

What Are Functions?Challenge: Simple Function Challenge: Calculating the Speed of a Car Scopes Passing Data into Functions Challenge: Fixing the Speed Function Challenge: Improving the Grade Categorizer Task: Defining a Compound Function Returning Data from Functions Default Values Challenge: Email Auto-Responder with Default Parameters

5. Exploring Arrays

What Are Arrays?Challenge: Defining An Array Challenge: Indexing Adding Values to an Array Challenge: Pushing Elements to an Array Removing Elements from an Array Challenge: Practicing `pop` & `shift`The `length` Property Challenge: Counting Elements The `includes` Method Challenge: Searching for Animals in the Zoo

6. Discovering Loops

The `for` Loop Task: Printing a Sequence The `while` Loop Challenge: Printing Fibonacci Sequence The `do-while` Loop Challenge: Random Multiple of 7 Using Loops with Arrays Challenge: Finding the Average Price of Items Summary

Returning Data from Functions

We can return any kind of value from a function using a return statement.


              123456
            
function sum(a, b) { 
  return a + b;
}

let result = sum(10, 15);
console.log(result); // Output: 25

General Syntax

The general syntax of a return statement is

js

Where <value> is optional. If no value is provided, the function returns undefined:


              1234567
            
function exampleFunc() {
  console.log("In the Function");
  return;
}

let result = exampleFunc();
console.log("Return value if nothing is returned:", result); // Output: undefined

How It Works?

The return statement stops the execution of the function, and returns to the point in code the function where it was called. Therefore, any code after return is ignored:


              1234567891011
            
function exampleFunc() {
  console.log(1);
  console.log(2);
  return true; // Execution stops here
  console.log(4); // Ignored
  console.log(5); // Ignored
}

console.log("Before Function Call");
console.log(exampleFunc()); // Output: true
console.log("After Function Call");

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Sektion 4. Kapitel 9

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Kursusindhold

Introduction to JavaScript

1. Getting Started

2. Manipulating Data

3. Conditional Statements

4. Mastering Functions

5. Exploring Arrays

6. Discovering Loops

Returning Data from Functions

We can return any kind of value from a function using a return statement.


              123456
            
function sum(a, b) { 
  return a + b;
}

let result = sum(10, 15);
console.log(result); // Output: 25

General Syntax

The general syntax of a return statement is

js

Where <value> is optional. If no value is provided, the function returns undefined:


              1234567
            
function exampleFunc() {
  console.log("In the Function");
  return;
}

let result = exampleFunc();
console.log("Return value if nothing is returned:", result); // Output: undefined

How It Works?

The return statement stops the execution of the function, and returns to the point in code the function where it was called. Therefore, any code after return is ignored:


              1234567891011
            
function exampleFunc() {
  console.log(1);
  console.log(2);
  return true; // Execution stops here
  console.log(4); // Ignored
  console.log(5); // Ignored
}

console.log("Before Function Call");
console.log(exampleFunc()); // Output: true
console.log("After Function Call");

Var alt klart?

Tak for dine kommentarer!

Sektion 4. Kapitel 9

Introduction to JavaScript

Returning Data from Functions

General Syntax

How It Works?

1. What will be the output of the following code?

2. What happens if a function has a return statement with no value?

3. What will be the output of the following code?

4. In the following code, what will be the value of `result`?

Introduction to JavaScript

Returning Data from Functions

General Syntax

How It Works?

1. What will be the output of the following code?

2. What happens if a function has a return statement with no value?

3. What will be the output of the following code?

4. In the following code, what will be the value of `result`?

Introduction to JavaScript

Returning Data from Functions

General Syntax

How It Works?

1. What will be the output of the following code?

2. What happens if a function has a return statement with no value?

3. What will be the output of the following code?

4. In the following code, what will be the value of result?

Introduction to JavaScript

Returning Data from Functions

General Syntax

How It Works?

1. What will be the output of the following code?

2. What happens if a function has a return statement with no value?

3. What will be the output of the following code?

4. In the following code, what will be the value of result?

4. In the following code, what will be the value of `result`?

4. In the following code, what will be the value of `result`?