Lesson 19 of 55
15 mins readUnion and Intersection Types
In Plain English
Union types allow a value to be one of several types, while intersection types merge multiple types together into a single combined type.
Core Rules to Remember
Union (|): Value can be any of the union member types.
Intersection (&): Value must satisfy all combined type requirements simultaneously.
Live Interactive Example
Hit Run Code to see it liveCombining Types with Unions and Intersections
Python 3.12
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Output Console
Click "Run Code" to view the rendered output.
How it works: printId accepts string and number, while post contains both createdAt and author.
Your Turn: Micro Challenge
No pressure! Edit the starter code below and test your solution with instant feedback.
Micro Exercise
Combine User Account Capabilities
- Define type Admin = { role: "admin"; permissions: string[] }.
- Define type Profile = { username: string }.
- Create type SuperUser = Admin & Profile and initialize root with username "root", role "admin", and permissions ["all"]. Print username and role.
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Sandbox Output
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