Introduction to TypeScript

Introduction to TypeScript

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1. TypeScript Fundamentals

This section introduces you to TypeScript. You will learn why TypeScript is valuable and how it differs from JavaScript.

What is TypeScript?

Simple variable declaration

Mathematics in TypeScript

Typed variable declaration

Code Syntax Correction Challenge

2. Conditional Statements

We're going to take control of the code! In this section, you'll learn how to set conditions for code execution in TypeScript. You'll discover why this is used and how to use it correctly, so that your code becomes the envy of all top programmers!

Comparison Operators

If-else statement

Day of the Week Condition Execution Challenge

Complex Conditions

Challenge: Commission Calculator

3. Arrays

Let's get acquainted with a convenient way to store data in a collection of elements - an array. You will learn how to create and use arrays, as well as how to add and work with elements in an array. An important and fundamental structure for any programmer.

Declaration and Advantages of Arrays

Working with Array Elements

Challenge: Modifying Arrays

4. Loops

Automate tasks with a large amount of data or variables. Loops will assist you in this, allowing you to process a large amount of data and quickly obtain results in just a few lines of code. We will explore the fundamental types of loops and teach you how to work with them effectively!

`break` keyword

Challenge (snail game)

`for` loop with arrays

Challenge (FizzBuzz)

`forEach` method

5. Functions

It's time to finally learn how to write your own functions that will perform the operations you specify. Functions will help you organize your code, breaking it into manageable pieces and calling them in a single line. It's time to learn!

Functions introduction

Parameters and Return Statement

Challenge (lottery)

Optional Parameters

Challenge (price calculator)

Course Content

Introduction to TypeScript

Challenge (FizzBuzz)

Task

The classic problem is called FizzBuzz. The task is very simple: You are given an array of random numbers, and the code for generating the numbers is provided above; please do not modify that code. Your task is to replace the array elements according to the following conditions:

If a number is divisible by 3, replace it with 'Fizz';
If a number is divisible by 5, replace it with 'Buzz';
If a number is divisible by both 3 and 5, replace it with 'FizzBuzz'.

As a result, you should return an array of numbers and strings. You can check the hints and solutions if you have any difficulties with solving this problem. This way, you will better absorb the information and improve your skills. May the force be with you!


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let randomNumbers: (number | string)[] = [];

// do not change the code below
for (let i = 0; i < 15; i++) {
  let randomNumber: number = Math.floor(Math.random() * 100); // Generating a random number from 0 to 99
  randomNumbers.push(randomNumber);
}
//do not change the code above

for (let i = 0; i < ___; i++) {
    // Assert that randomNumbers[i] is a number before using the modulus operator
    let num = randomNumbers[i] as number;
  
    if (___) {
        randomNumbers[i] = '___'
    } else if (___) {
        ___ = 'Fizz'
    } else if (___) {
        ___
    }
}

console.log(randomNumbers);

Everything was clear?

Section 4. Chapter 7

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