Video: Union Types in TypeScript

A union type in TypeScript allows you to declare a value that can have different types.

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Timeline:

00:08 - What is a union type?

00:51 - A union in set theory

01:30 - Creating a type alias

02:11 - Benefits of type aliases

02:24 - Common mistakes with unions

03:16 - Union types in index signatures

04:40 - Discriminated Unions (Tagged Unions)

08:08 - Union types and interfaces

Resources:

➜ Unions & Intersections: https://www.typescriptlang.org/docs/handbook/unions-and-intersections.html

➜ Venn diagram: https://en.wikipedia.org/wiki/Venn_diagram#Overview

➜ Type aliases: https://www.typescriptlang.org/docs/handbook/advanced-types.html#type-aliases

➜ Discriminated Unions: https://basarat.gitbook.io/typescript/type-system/discriminated-unions

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