Kursinnhold

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

What Are Functions?

Definition

Functions are a feature in programming that lets us reserve a block of code to be executed later. This also enables us to execute that block of code multiple times with ease.

The basic syntax of defining a function is as follows:

js

Here function is the keyword used to define a function, and funcName represents the name of the function that we want to create.

Creating a function is more accurately referred to as "defining" a function. The code which defines a function is referred to as the "function definition" code.

Note

The DRY (Don't Repeat Yourself) principle is a core programming concept that emphasizes minimizing code duplication. It encourages writing each piece of logic once and reusing it whenever necessary. This improves the code's readability and efficiency. Functions play an important role in adhering to this principle, as they allow us to eliminate any redundant code.

Following is an example of a function which draws a triangle in the console:


              123456789
            
function drawTriangle() {
  console.log("*");
  console.log("* *");
  console.log("* * *");
  console.log("* * * *");
  console.log("* * * * *");
}

drawTriangle();

It's possible to execute a function more than once:


              1234567891011
            
function drawTriangle() {
  console.log("*");
  console.log("* *");
  console.log("* * *");
  console.log("* * * *");
  console.log("* * * * *");
}

drawTriangle();
drawTriangle();
drawTriangle();

Note

Executing a function is also sometimes referred to as calling a function. Similarly, a statement that executes a function (for example: myFunc()) is referred to as a Function Call.

It is recommended to name the functions meaningfully such that the name of the function accurately reflects the operation it performs.

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Seksjon 4. Kapittel 1

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Kursinnhold

Introduction to JavaScript

1. Getting Started

2. Manipulating Data

3. Conditional Statements

4. Mastering Functions

5. Exploring Arrays

6. Discovering Loops

What Are Functions?

Definition

Functions are a feature in programming that lets us reserve a block of code to be executed later. This also enables us to execute that block of code multiple times with ease.

The basic syntax of defining a function is as follows:

js

Here function is the keyword used to define a function, and funcName represents the name of the function that we want to create.

Creating a function is more accurately referred to as "defining" a function. The code which defines a function is referred to as the "function definition" code.

Note

Following is an example of a function which draws a triangle in the console:


              123456789
            
function drawTriangle() {
  console.log("*");
  console.log("* *");
  console.log("* * *");
  console.log("* * * *");
  console.log("* * * * *");
}

drawTriangle();

It's possible to execute a function more than once:


              1234567891011
            
function drawTriangle() {
  console.log("*");
  console.log("* *");
  console.log("* * *");
  console.log("* * * *");
  console.log("* * * * *");
}

drawTriangle();
drawTriangle();
drawTriangle();

Note

Executing a function is also sometimes referred to as calling a function. Similarly, a statement that executes a function (for example: myFunc()) is referred to as a Function Call.

It is recommended to name the functions meaningfully such that the name of the function accurately reflects the operation it performs.

Alt var klart?

Takk for tilbakemeldingene dine!

Seksjon 4. Kapittel 1

Introduction to JavaScript

What Are Functions?

1. What keyword is used to define a function in JavaScript?

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

3. Which of the following is NOT true about functions?

Introduction to JavaScript

What Are Functions?

1. What keyword is used to define a function in JavaScript?

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

3. Which of the following is NOT true about functions?