Stefan Baumgartner • 2/3/2020

TypeScript: Check for object properties and narrow down type

Read Original

This article explains how TypeScript's control flow analysis works for type narrowing and addresses a limitation: checking for object properties. It provides a detailed solution using a custom `hasOwnProperty` helper function with type predicates to properly extend an object's type when a property is found, improving type safety.

0 comments
#TypeScript #type narrowing #type guards
TypeScript: Check for object properties and narrow down type

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