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natecook1000/InterpolationDefault.swift

Created June 2, 2023 01:07
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InterpolationDefault.swift
extension String.StringInterpolation {
mutating func appendInterpolation<T>(_ value: T?, default: @autoclosure () -> String) {
self.appendLiteral(value.map(String.init(describing:)) ?? `default`())
}
}
let num = Int("21")
print("The number is: \(num, default: "<invalid>")")
// The number is: 21
let num2 = Int("asd")
print("The number is: \(num2, default: "<invalid>")")
// The number is: <invalid>
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