--- title: Is Objective-C BOOL a boolean type? It depends | daily.dev description: This article explores the Objective-C BOOL type and how it is defined on different Apple platforms. It discusses the differences in defining BOOL on Apple... canonical: https://daily.dev/posts/is-objective-c-bool-a-boolean-type-it-depends-4hsyynhuv twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Is Objective-C BOOL a boolean type? It depends | daily.dev og:description: This article explores the Objective-C BOOL type and how it is defined on different Apple platforms. It discusses the differences in defining BOOL on Apple... og:url: https://daily.dev/posts/is-objective-c-bool-a-boolean-type-it-depends-4hsyynhuv og:image: https://api.daily.dev/og/posts/4HsyYNhuv.png og:image:alt: Is Objective-C BOOL a boolean type? It depends og:image:width: 1200 og:image:height: 630 og:locale: en --- [Hacker News](https://daily.dev/sources/hn) [Read post](https://api.daily.dev/r/4HsyYNhuv) # [Is Objective-C BOOL a boolean type? It depends](https://api.daily.dev/r/4HsyYNhuv "Go to post") This article explores the Objective-C BOOL type and how it is defined on different Apple platforms. It discusses the differences in defining BOOL on Apple Silicon and Intel Macs and provides examples of unexpected behavior. [#general-programming](/tags/general-programming "Check all #general-programming posts")[#objective-c](/tags/objective-c "Check all #objective-c posts") Jan 10, 2024•11m read time•From [jviotti.com](https://api.daily.dev/r/4HsyYNhuv "jviotti.com") [](https://api.daily.dev/r/4HsyYNhuv "Go to post") Table of contents [An example of unexpected behavior](https://api.daily.dev/r/4HsyYNhuv?a=an-example-of-unexpected-behavior "An example of unexpected behavior")[Exploring the Objective-C runtime](https://api.daily.dev/r/4HsyYNhuv?a=exploring-the-objective-c-runtime "Exploring the Objective-C runtime")[Fiddling with \_\_OBJC\_BOOL\_IS\_BOOL](https://api.daily.dev/r/4HsyYNhuv?a=fiddling-with-%5F%5Fobjc%5Fbool%5Fis%5Fbool "Fiddling with __OBJC_BOOL_IS_BOOL")[Digging deeper into LLVM](https://api.daily.dev/r/4HsyYNhuv?a=digging-deeper-into-llvm "Digging deeper into LLVM")[Summary](https://api.daily.dev/r/4HsyYNhuv?a=summary "Summary") 17 Impressions Comment Bookmark Copy Share your thoughtsPost [](https://daily.dev/sources/hn) [Hacker News](https://daily.dev/sources/hn "https://daily.dev/sources/hn") Hacker News is a community-driven platform for sharing and discussing technology news, startups, and... 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