TkDodo Dominik Dorfmeister • 2/19/2022

optional vs. undefined

Read Original

This article explains the crucial distinction in TypeScript between optional parameters (using '?') and parameters that can be 'undefined'. It demonstrates how these two definitions are not the same and how this difference impacts function invocation, using a real-world example from React Query v4 refactoring where this distinction caused test failures.

0 comments
#TypeScript #function parameters #undefined
optional vs. undefined

Comments

No comments yet

Be the first to share your thoughts!

Browser Extension

Get instant access to AllDevBlogs from your browser

Top of the Week

1
The Beautiful Web
Jens Oliver Meiert • 2 votes
2
When your coding agent doesn’t understand your project, you’ll get junk
Benjamin Cane • 1 votes
3
LLM Use in the Python Source Code
Miguel Grinberg • 1 votes
4
Wagon’s algorithm in Python
John D. Cook • 1 votes
5
An example conversation with Claude Code
Dumm Zeuch • 1 votes