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derefr
on May 18, 2017
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Swift is like Kotlin
Is there a parse-time reason that they required the "_" syntax, rather than simply:
func greet(greeting: String, personName: String) { print("\(greeting), \(personName)!") }
thramp
on May 18, 2017
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It's a side effect of labeled arguments. The caller would use the function greet as `greet(greeting: "Hello", personName: "Alice")`.
masklinn
on May 18, 2017
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The reason is that named parameters is the default, so in your case greeting and personName are both "internal" and "external" names. "_ greeting" sets the external name to _ (aka positional) and the internal name to "greeting" instead.
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