--- title: "Meaning & Key Takeaway of: Ask anyone who's been around the NSBlock…" description: "\"“Ask anyone who's been around the NSBlock a few times: Key-Value Observing has the worst API in all of Cocoa.”\" — Mattt Thompson" image: "https://sms4smile.com/quotes/i/a85/mattt-thompson-71141_quote_ask-anyone-who-s-been-around-the-nsblock_1415217.jpg" --- # Ask anyone who's been around the NSBlock a few times… ![“Ask anyone who's been around the NSBlock a few times: Key-Value Observing has the worst API in all of Cocoa.” quote by Mattt Thompson](https://sms4smile.com/quotes/i/a85/mattt-thompson-71141_quote_ask-anyone-who-s-been-around-the-nsblock_1415217.jpg) [Download](https://sms4smile.com/quotes/i/a85/mattt-thompson-71141_quote_ask-anyone-who-s-been-around-the-nsblock_1415217.jpg) [Open image](https://sms4smile.com/quotes/i/a85/mattt-thompson-71141_quote_ask-anyone-who-s-been-around-the-nsblock_1415217.jpg) > ““Ask anyone who's been around the NSBlock a few times: Key-Value Observing has the worst API in all of Cocoa.”” [Mattt Thompson](https://sms4smile.com/quotes/author/mattt-thompson/) ## About This Quote This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation. Key‑Value Observing API is considered the most problematic in Cocoa. **In simple terms:** Key‑Value Observing has the worst Cocoa API. Key Takeaway Avoid or improve KVO usage. Themes software development API criticism Cocoa Mood critical technical Type analytical pragmatic When to use this quote - iOS app development - code maintenance - team onboarding Key Concepts programming patterns framework design Questions to Reflect On - What are the main pain points? - How can you mitigate them? 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