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

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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

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 

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

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