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Learn TypeScript: The Complete Course for Beginners

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Before We Begin

About This Path

About This Module

Introduction

What is TypeScript?TypeScript Philosophy Why Use TypeScript?Using TypeScript

The Basics of Variables

Declaring a Variable Declaring Types in Untyped Code Hoisting Variables TypeScript Scope is JavaScript Scope Switch Scope The Multiple Methods of Declaring a String String-Tagged Templates What is a Number in TypeScript?Booleans, Functions, and Objects Avoiding `any` at Any Time Possible Mutable and Immutable Arrays Undefined Versus Null Returning nothing with Void The Primitive Type never Unknown: A Better any Literal Type to Narrow Primitive Type Symbol and Unique Symbol Casting to Change Type

Comment

TypeScript's Comments are like JavaScript's with One Exception

Enum

Enum With and Without Values Accessing Enum Values Speeding Up Enum Merging and Adding Functionality to Enum

Generic Type

Generic Generic and Classes Generic Constraint Generic with Construction Functions Generic Outside Class Generic Comparison Generic Inference Generic Default Generic and keyof

Functions

Definition Named and Anonymous Functions Function and Inference Variables Generic Return Type, Optional Parameter and Default Value Functions in Classes Function Relationship with "this"Function and Inference Return Types Overload Functions to Enrich your Definition String Literal and Overload Function Types of Function Headers

Mapped Type

Definition and Usages Immutable Data with Readonly Partial Nullable Pick Omit Record Extract Exclude ReturnType Custom Mapped Type

Objects

Introduction to TypeScript's Many Objects The Curly Braces Object New Object Lowercase vs UpperCase Object

Index Signature

Definitions and Usages String or Number Indexes Members of the Same Type Keys with Constants and Symbols

Variables Advanced

Intersecting with Types, Interfaces, and Generics Literal Type, Narrowing, and Const Union with Types and Tagged Union Const Assertion for Literal Values Tuple For Type and Length Arrays Casting to Change Type keyof to Validate a Member's Name On How TypeScript Handles Variance How to Narrow a Type with the in Operator What is a Conditional Type?TypeScript Inference Set and Dictionary

Exception

Creating an Exception Catching Synchronous Exceptions Catching Asynchronous Exceptions Assertion Functions

Alias

Aliases with the Structural Behavior of TypeScript Aliases with Type Aliases with Generic Types and Recursivity The Differences between Type Aliases and Interfaces Branded Alias

Type Checking

Comparing Variables Type Checking with typeof Type Checking with instanceof Type Checking and Interface with a Discriminator Type Checking with Intersections Type Checking an Interface with Custom User-Defined Type Guard Optional Chaining and Optional Element Access Nullish Coalescing Assertion Functions

Iterators

Iterating an Object's Keys with For-In Iterating an Object with Standard For/While Iterating and the Asynchronous Loop

Manipulating Objects and Array

Typing an Array Array with a Skipped Value Destructuring an Array Destructuring an Object The Spread Operator and Arrays The Spread Operator and Objects The Bang Operator

Sharing Code

Namespace Module Default Module Lazy Loading Module Import Shortcuts Definition Files and Global Definition Files Definition File Locations

Conclusion

Appendix Final Remarks

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About This Path

About This Path

Get introduced to the prerequisites and course contents of this path.

Welcome to the “TypeScript for Programmers” path. In this path, we’ll learn the basic and advanced concepts of TypeScript. By the end of this path, we’ll have sufficient knowledge to implement these concepts with the Angular application.

Prerequisites

To take full advantage of this path, you should know the basics of JavaScript. Since this path covers different concepts of TypeScript, it’s assumed that you already know some basic concepts of ...