Code  Camp

Code Camp

1592272060

Advanced TypeScript Types Cheat Sheet (with Examples)

TypeScript is a typed language that allows you to specify the type of variables, function parameters, returned values, and object properties.

Here an advanced TypeScript Types cheat sheet with examples.

Let’s dive in.

  • Intersection Types
  • Union Types
  • Generic Types
  • Utility Types
  • Partial
  • Required
  • Readonly
  • Pick
  • Omit
  • Extract
  • Exclude
  • Record
  • NonNullable
  • Mapped Types
  • Type Guards
  • Conditional Types

Intersection Types

An intersection type is a way of combining multiple types into one. This means that you can merge a given type A with a type B or more and get back a single type with all properties.

type LeftType = {
  id: number
  left: string
}

type RightType = {
  id: number
  right: string
}

type IntersectionType = LeftType & RightType

function showType(args: IntersectionType) {
  console.log(args)
}

showType({ id: 1, left: "test", right: "test" })
// Output: {id: 1, left: "test", right: "test"}

As you can see, IntersectionType combines two types - LeftType and RightType and uses the & sign to construct the intersection type.

Union Types

Union types allow you to have different types annotation within a given variable.

type UnionType = string | number

function showType(arg: UnionType) {
  console.log(arg)
}

showType("test")
// Output: test

showType(7)
// Output: 7

The function showType is a union type that accepts both strings and numbers as a parameter.

Generic Types

A generic type is a way of reusing part of a given type. It helps to capture the type T passed in as a parameter.

function showType<T>(args: T) {
  console.log(args)
}

showType("test")
// Output: "test"

showType(1)
// Output: 1

To construct a generic type, you need to use the brackets and pass T as a parameter.

Here, I use T (the name is up to you) and then, call the function showType twice with different type annotations because it’s generic - it can be reused.

interface GenericType<T> {
  id: number
  name: T
}

function showType(args: GenericType<string>) {
  console.log(args)
}

showType({ id: 1, name: "test" })
// Output: {id: 1, name: "test"}

function showTypeTwo(args: GenericType<number>) {
  console.log(args)
}

showTypeTwo({ id: 1, name: 4 })
// Output: {id: 1, name: 4}

Here, we have another example that has an interface GenericType which receives a generic type T. And since it’s reusable, we can call it first with a string and then a number.

interface GenericType<T, U> {
  id: T
  name: U
}

function showType(args: GenericType<number, string>) {
  console.log(args)
}

showType({ id: 1, name: "test" })
// Output: {id: 1, name: "test"}

function showTypeTwo(args: GenericType<string, string[]>) {
  console.log(args)
}

showTypeTwo({ id: "001", name: ["This", "is", "a", "Test"] })
// Output: {id: "001", name: Array["This", "is", "a", "Test"]}

A generic type can receive several arguments. Here, we pass in two parameters: T and U, and then use them as type annotations for the properties. That said, we can now use the interface and provide different types as arguments.

#typescript #javascript #angular #developer

What is GEEK

Buddha Community

Advanced TypeScript Types Cheat Sheet (with Examples)

The Definitive Guide to TypeScript & Possibly The Best TypeScript Book

TypeScript Deep Dive

I've been looking at the issues that turn up commonly when people start using TypeScript. This is based on the lessons from Stack Overflow / DefinitelyTyped and general engagement with the TypeScript community. You can follow for updates and don't forget to ★ on GitHub 🌹

Reviews

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  • @basarat's intro to @typescriptlang is still one of the best going (if not THE best) link
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Get Started

If you are here to read the book online get started.

Translations

Book is completely free so you can copy paste whatever you want without requiring permission. If you have a translation you want me to link here. Send a PR.

Other Options

You can also download one of the Epub, Mobi, or PDF formats from the actions tab by clicking on the latest build run. You will find the files in the artifacts section.

Special Thanks

All the amazing contributors 🌹

Share

Share URL: https://basarat.gitbook.io/typescript/

Author: Basarat
Source Code: https://github.com/basarat/typescript-book/ 
License: View license

#typescript #opensource 

Lawrence  Lesch

Lawrence Lesch

1628685660

How to Advanced TypeScript Types Cheat Sheet (with Examples)

TypeScript is a typed language that allows you to specify the type of variables, function parameters, returned values, and object properties.

Here an advanced TypeScript Types cheat sheet with examples.

Sorry for the interrupt!

If you're interested in learning TypeScript in a comprehensive way, I highly recommend this bestseller course: Understanding TypeScript - 2020 Edition

It's an affiliate link, so by purchasing, you support the blog at the same time.

Let's dive in

  • Intersection Types
  • Union Types
  • Generic Types

#typescript 

Code  Camp

Code Camp

1592272060

Advanced TypeScript Types Cheat Sheet (with Examples)

TypeScript is a typed language that allows you to specify the type of variables, function parameters, returned values, and object properties.

Here an advanced TypeScript Types cheat sheet with examples.

Let’s dive in.

  • Intersection Types
  • Union Types
  • Generic Types
  • Utility Types
  • Partial
  • Required
  • Readonly
  • Pick
  • Omit
  • Extract
  • Exclude
  • Record
  • NonNullable
  • Mapped Types
  • Type Guards
  • Conditional Types

Intersection Types

An intersection type is a way of combining multiple types into one. This means that you can merge a given type A with a type B or more and get back a single type with all properties.

type LeftType = {
  id: number
  left: string
}

type RightType = {
  id: number
  right: string
}

type IntersectionType = LeftType & RightType

function showType(args: IntersectionType) {
  console.log(args)
}

showType({ id: 1, left: "test", right: "test" })
// Output: {id: 1, left: "test", right: "test"}

As you can see, IntersectionType combines two types - LeftType and RightType and uses the & sign to construct the intersection type.

Union Types

Union types allow you to have different types annotation within a given variable.

type UnionType = string | number

function showType(arg: UnionType) {
  console.log(arg)
}

showType("test")
// Output: test

showType(7)
// Output: 7

The function showType is a union type that accepts both strings and numbers as a parameter.

Generic Types

A generic type is a way of reusing part of a given type. It helps to capture the type T passed in as a parameter.

function showType<T>(args: T) {
  console.log(args)
}

showType("test")
// Output: "test"

showType(1)
// Output: 1

To construct a generic type, you need to use the brackets and pass T as a parameter.

Here, I use T (the name is up to you) and then, call the function showType twice with different type annotations because it’s generic - it can be reused.

interface GenericType<T> {
  id: number
  name: T
}

function showType(args: GenericType<string>) {
  console.log(args)
}

showType({ id: 1, name: "test" })
// Output: {id: 1, name: "test"}

function showTypeTwo(args: GenericType<number>) {
  console.log(args)
}

showTypeTwo({ id: 1, name: 4 })
// Output: {id: 1, name: 4}

Here, we have another example that has an interface GenericType which receives a generic type T. And since it’s reusable, we can call it first with a string and then a number.

interface GenericType<T, U> {
  id: T
  name: U
}

function showType(args: GenericType<number, string>) {
  console.log(args)
}

showType({ id: 1, name: "test" })
// Output: {id: 1, name: "test"}

function showTypeTwo(args: GenericType<string, string[]>) {
  console.log(args)
}

showTypeTwo({ id: "001", name: ["This", "is", "a", "Test"] })
// Output: {id: "001", name: Array["This", "is", "a", "Test"]}

A generic type can receive several arguments. Here, we pass in two parameters: T and U, and then use them as type annotations for the properties. That said, we can now use the interface and provide different types as arguments.

#typescript #javascript #angular #developer

Jack  C

Jack C

1596094975

Advanced TypeScript Types cheat sheet (with examples)

TypeScript is a typed language that allows you to specify the type of variables, function parameters, returned values, and object properties.

Here an advanced TypeScript Types cheat sheet with examples.

Let’s dive in

Intersection Types
Union Types
Generic Types
Utility Types
Partial
Required
Readonly
Pick
Omit
Extract
Exclude
Record
NonNullable
Mapped types
Type Guards
Conditional Types

#typescript #javascript

Ananya Gupta

Ananya Gupta

1604922206

Top 7 Advantages Of Advanced Excel Learning

Advanced Excel Certification offers numerous job opportunities that have come up. Lately, companies search for a talented personality who holds great knowledge in excel. However, simply basic knowledge isn’t sufficient. If you would like to be a part of a well-renowned company then you want to have the excel certification matching industrial standards.

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Know More About Advanced Excel?

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This type of certification is all about brushing up your administration, management, and analytical skills which in today’s market is sort of important. To match up with the flexible needs of the clients, it’s important for you to be advanced and for this such training can certainly be helpful.

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There are ample Excel Training Courses that you simply may encounter, but choosing a certification course in Advanced excel possesses its perks for you also as for the corporate. Listed are a few that you simply got to know.

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Quick Tip which will Help:

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Now you’ll boost your knowledge during a spreadsheet, play with new financial

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