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// Objective-C style (verbose): // NSString *name = @"Alice"; // NSArray *numbers = @[@1, @2, @3]; // [numbers enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { // NSLog(@"%@", obj); // }]; // Swift equivalent (clean): let name = "Alice" let numbers = [1, 2, 3] numbers.forEach { print($0) } // @objc interoperability import Foundation class MyService: NSObject { @objc func greet(_ name: String) -> String { return "Hello, \(name)" } } // Swift-only features struct Point { var x: Double var y: Double func distance(to other: Point) -> Double { let dx = x - other.x let dy = y - other.y return (dx * dx + dy * dy).squareRoot() } } let a = Point(x: 0, y: 0) let b = Point(x: 3, y: 4) print(a.distance(to: b)) // 5.0
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