Hack vs Objective-C: What are the differences?
Developers describe Hack as "A programming language for HHVM that interoperates seamlessly with PHP". Hack provides instantaneous type checking via a local server that watches the filesystem. It typically runs in less than 200 milliseconds, making it easy to integrate into your development workflow without introducing a noticeable delay. On the other hand, Objective-C is detailed as "The primary programming language you use when writing software for OS X and iOS". Objective-C is a superset of the C programming language and provides object-oriented capabilities and a dynamic runtime. Objective-C inherits the syntax, primitive types, and flow control statements of C and adds syntax for defining classes and methods. It also adds language-level support for object graph management and object literals while providing dynamic typing and binding, deferring many responsibilities until runtime.
Hack and Objective-C can be categorized as "Languages" tools.
"Interoperates seamlessly with php" is the primary reason why developers consider Hack over the competitors, whereas "Ios" was stated as the key factor in picking Objective-C.
According to the StackShare community, Objective-C has a broader approval, being mentioned in 851 company stacks & 363 developers stacks; compared to Hack, which is listed in 8 company stacks and 3 developer stacks.