Swift Vs Roehl - LifeStyle

0 SWIFT 4.2 Sometimes this happened just because there is space in slug OR absence of URL encoding for parameters passing through API URL. Swift needs a convention for saying what the name of a function is, including not only the function name itself (before the parentheses) but also the external names of the parameters. TL;DR Swift 5.9 $0, $1, $2 are Closure 's first, second and third Shorthand Argument Names or, in other words, implicit parameter names, if you like.

The shorthand argument names are automatically provided by Swift. As you know, a closure is a self-contained block of functionality (a function/method without name) that can be passed around and used in your code. Closures have different names in ... What does $0 and $1 mean in Swift Closures?

Swift Vs Roehl, - Stack Overflow