Generics in swift

1. Generics
Generic code enables you to write flexible, reusable functions and types that can work with any type,
subject to requirements that you define. You can write code that avoids duplication and expresses its
intent in a clear, abstracted manner.
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https://docs.swift.org/swift-book/LanguageGuide/Generics.html

2. Type Safe
Type Safe: 컴파일 시 Type Check [fail fast]
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3. Type Parameter
Type Argument
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4. Generic Function
func GenericFunction<T>( … ) -> T {
…
}
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5. Type Constraint
func GenericFunction<T>( … ) -> T where T: Protocol or Class {
…
}
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6. Generic Closure
func GenericFunction<T>(completionHandler: (T)->Void) {
…
}
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7. Protocol Associated
Types
protocol DecodingTransformType {
associatedtype Decoded
associatedtype Encoded
func transform(decoded: Decoded?) -> Encoded?
}
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8. ObjectMapper
https://github.com/tristanhimmelman/ObjectMapper
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9. NSString * value = info[@“key”] /*objc */
let value: String = info[“key”]
let value: String = info[“key”] as! String
let value: String = info[“key”] as? String ?? “”
Cannot convert value of type 'Any?' to specified type 'String'
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10. let value: String = try info.value(“key”)
value = try info.value(“key”)
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11. Live Coding
Dictionary<K, V> + Extension + Generic Function
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