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nukka123
/ DefaultStringInterpolation-opt-or.swift
Created
May 2, 2025 15:46
DefaultStringInterpolation "\(opt:or)"
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| extension DefaultStringInterpolation { | |
| mutating func appendInterpolation<T>( | |
| opt value: T?, | |
| or alternative: @autoclosure () -> String = String(describing: Optional<T>.none) | |
| ) { | |
| if let value { | |
| appendInterpolation(value) | |
| } else { | |
| appendLiteral(alternative()) |
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| extension Binding { | |
| func bool<T>() -> Binding<Bool> where Value == Optional<T> { | |
| Binding<Bool> ( | |
| get: { | |
| self.wrappedValue != nil | |
| }, | |
| set: { newValue in | |
| // alertはボタンタップで非表示に変化の時にfalseをsetする。 | |
| // その際には、元のOptional値をnilに更新する。 | |
| if !newValue { |
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| import Foundation | |
| let s1 = "(Hello, String, か゚か゚か゚)" | |
| print("s1:", s1) | |
| let c1: Character = "A" | |
| let c2: Character = "B" | |
| let s2 = String([c1, c2]) | |
| print("s2:", s2) |