Swift

Swift delivers 2.6x faster performance than Objective-C and runs 4.1 million lines of code on iOS alone, making it the most efficient language for Apple's ecosystem. With 92% of the top 100 iOS apps using Swift, it's the undisputed leader for Apple development, offering a safety-first design that reduces crashes by 70% compared to older languages. Median salary for Swift developers is $115,000, 7% above JavaScript's median.