Contenuti del Corso

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

Constants

Definition

Constants are similar to variables however their value, as expressed by the name, is always constant or unchanged.

We can declare a constant using the const keyword, and it's important to initialize it at the same point as well. Following is the syntax for constant declaration & initialization:

js

For example:

js

Changing the value of a constant results in an error:

js

The names of the constants follow the same naming rules as the variables.

1. What is a constant in JavaScript?

2. Which keyword is used to declare a constant in JavaScript?

3. What happens if you try to reassign a value to a constant?

4. Which of the following correctly declares and initializes a constant in a single statement?

What is a constant in JavaScript?

Select the correct answer

A variable that can change its value.

A value that never changes once assigned.

A function that stores data.

A temporary variable.

Which keyword is used to declare a constant in JavaScript?

Select the correct answer

var

let

constant

const

What happens if you try to reassign a value to a constant?

Select the correct answer

The value updates successfully.

The program ignores the change.

An error occurs.

The value resets to null.

Which of the following correctly declares and initializes a constant in a single statement?

Select the correct answer

const PI; PI = 3.14;

constant PI = 3.14;

const PI = 3.14;

let const PI = 3.14;

Tutto è chiaro?

Come possiamo migliorarlo?

Grazie per i tuoi commenti!

Sezione 2. Capitolo 6

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Contenuti del Corso

Introduction to JavaScript

1. Getting Started

2. Manipulating Data

3. Conditional Statements

4. Mastering Functions

5. Exploring Arrays

6. Discovering Loops

Constants

Definition

Constants are similar to variables however their value, as expressed by the name, is always constant or unchanged.

We can declare a constant using the const keyword, and it's important to initialize it at the same point as well. Following is the syntax for constant declaration & initialization:

js

For example:

js

Changing the value of a constant results in an error:

js

The names of the constants follow the same naming rules as the variables.

1. What is a constant in JavaScript?

2. Which keyword is used to declare a constant in JavaScript?

3. What happens if you try to reassign a value to a constant?

4. Which of the following correctly declares and initializes a constant in a single statement?

What is a constant in JavaScript?

Select the correct answer

A variable that can change its value.

A value that never changes once assigned.

A function that stores data.

A temporary variable.

Which keyword is used to declare a constant in JavaScript?

Select the correct answer

var

let

constant

const

What happens if you try to reassign a value to a constant?

Select the correct answer

The value updates successfully.

The program ignores the change.

An error occurs.

The value resets to null.

Which of the following correctly declares and initializes a constant in a single statement?

Select the correct answer

const PI; PI = 3.14;

constant PI = 3.14;

const PI = 3.14;

let const PI = 3.14;

Tutto è chiaro?

Come possiamo migliorarlo?

Grazie per i tuoi commenti!

Sezione 2. Capitolo 6