Closures are self-contained blocks of functionality that can be passed around and used in your code. They're Swift's version of lambdas or anonymous functions from other languages. Combined with collection methods like map, filter, and reduce, closures unlock a powerful functional programming style.
Closure Basics
let greet = { (name: String) -> String in
return "Hello, \(name)!"
}
print(greet("Swift")) // Hello, Swift!Figure 1 — How a closure captures variables from its surrounding scope. The closure holds a reference to the outer variable, allowing it to read and mutate the value even after the outer scope has exited.
Full content for this chapter will be added in a future update. The complete article covers closure syntax, shorthand arguments, trailing closures, capturing values, map, filter, reduce, compactMap, flatMap, and lazy collections.
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