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Introduction to TypeScript
course content

Зміст курсу

Introduction to TypeScript

Introduction to TypeScript

1. TypeScript Fundamentals
What is TypeScript?SyntaxSimple variable declarationMathematics in TypeScriptTyped variable declarationCommentsCode Syntax Correction Challenge
2. Conditional Statements
Comparison Operatorsif statementIf-else statementDay of the Week Condition Execution ChallengeComplex ConditionsSwitchChallenge: Commission Calculator
3. Arrays
Declaration and Advantages of ArraysWorking with Array ElementsArray TypingChallenge: Modifying ArraysSpread Syntax
4. Loops
While-Loop`break` keywordDo-While LoopChallenge (snail game)`for` loop`for` loop with arrays Challenge (FizzBuzz)`forEach` method
5. Functions
Functions introductionParameters and Return StatementChallenge (lottery)Optional ParametersDefault ValuesChallenge (price calculator) Summary

book`forEach` method

There's also a very interesting method called forEach() for working with array elements. It's an advanced topic for a beginner, but you definitely need to know about it. With this method, you can save a lot of time and reduce the number of lines of code. Let's take a look at an example of how it's used and break down how it works:


              
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let numbers = [1, 2, 3, 4, 5];

numbers.forEach((number) => {
    console.log(number);
});
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In this example:

  1. numbers is the original array containing numbers;
  2. .forEach is the method call on the numbers array;
  3. (number) => { console.log(number); } is the callback function that will be executed for each element in the array. In this case, it logs each element to the console.

It's important to note that the forEach method doesn't modify the original array and doesn't return a new one. It's designed for side effects like displaying content or updating other data.

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