TypeScript Essence | AccademiaDev

TypeScript Basics

1 Introduction to TypeScript 🎁
2 Type Annotations 🎁
3 Typing Functions 📋🎁
4 Compiling TypeScript 🎁
5 Inference 📋🎁
6 Any, void, unknown 📋🎁

Real World TypeScript

7 Arrays and Tuples
8 Types and Interfaces 📋
9 Intersections and Unions 📋
10 Assertions 📋
11 Never
12 Enums 📋
13 Const assertions 📋
14 Type Guards 📋
15 Assertion Functions 📋
16 Function Overloading

Advanced Types

17 Generics 📋
18 Mapped Types and Lookup Types 📋
19 Conditional Types 📋
20 Template Literal Types
21 Utility Types

Classes and OOP

22 Classes in TypeScript 📋
23 Abstract Classes 📋
24 Mixins
25 Decorators

Bonus

26 Nominal Typing
27 Declaration Files
28 Strict Flags

Quiz

#1Which annotation should be used to specify that `isAvailable` is a boolean variable?

let isAvailable: bool = true;
let isAvailable: Boolean = true;
let isAvailable: boolean = true;
let isAvailable: boolType = true;

#2What is the correct TypeScript annotation for a variable `age` that holds an integer value?

let age: integer = 25;
let age: number = 25;
let age: int = 25;
let age: numeric = 25;

#3A variable which has been declared but not initialized...

cannot be used
can be used after a value is assigned to it
cannot be used unless we include undefined in its type

#4`typeof` returns...

the native JavaScript type of a variable
the TypeScript type of a variable

#5How do you make a parameter optional?

By adding a ? after its name
By adding a ? after its type
By setting it = null
By setting it = any

#6Which of these is a correct way to type a rest parameter?

params: string[]
...params: string[]
...params: string
...params[]: string
...params[]: string[]