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@interface BaseViewModel : NSObject
- (void)baseMethod;
@end

@implementation BaseViewModel
- (void)baseMethod {}
@end

// ---------------------------------------------------------------------------------------------------------------------

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#import <Foundation/Foundation.h>

// Assume -fobjc-arc ... 假設有 ARC
//
// 存成 `main.m` 然後在 Terminal 跑 `clang -framework Foundation -fobjc-arc -o main main.m && ./main && rm main`
// 然後在 `./main` 就會動囉
//

NSArray *ggFunction1(NSError *__autoreleasing *error) {
    @autoreleasepool {

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#import <Foundation/Foundation.h>

// Assume -fno-objc-arc ... 假設沒 ARC

@interface MyObject: NSObject

@end

@implementation MyObject

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struct String {
    mutating func append(_ c: Character)
    mutating func append(_ other: String)
}

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viewController.dismiss(true)  // bad
viewController.dismiss(animated: true)
viewController.dismissAnimated(true)  // worse

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let friends: [Friend] = ...
friends.remove(ted)  // remove(_:)
friends.remove(at: positionOfTed)  // remove(at:)

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#include <iostream>

typedef struct {
    int quotient;
    int remainder;
} DivideResult;

DivideResult divide(int dividend, int divisor) {
    return (DivideResult){.quotient=dividend/divisor, .remainder=dividend%divisor};
}

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func move(from origin: String, to destination: String) -> String {
    return "Move from \(origin) to \(destination)."
}
let string = move(from: "Tokyo", to: "Taipei")
print(string)

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func move(from: String, to: String) -> String {
    return "Move from \(from) to \(to)."
}
let string = move(from: "Tokyo", to: "Taipei")
print(string)

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public class Example {
    static String move(String origin, String destination) {
        return String.format("Move from %s to %s.", origin, destination);
    }

    public static void main(String[] args) {
        String string = Example.move("Tokyo", "Taipei");
        System.out.println(string);
    }
}