Swift: "if let" and "while let" might as well support full pattern matching the way "switch...case" does

Originator:pyry.jahkola
Number:rdar://20185737 Date Originated:2015-03-17
Status:Duplicate of 19382905 (Open/Closed) Resolved:
Product:Developer Tools Product Version:
Classification:Feature (new) Reproducible:
 
Summary:
It seems to me the switch statement gets a bit heavy when I only need to pattern match one specific case and make a side effect with the associated values of the matched enum. Why not support this syntax in "if let" and "while let" too?

```
enum EitherString {
  case Value(String)
  case Error(String)
}

let x: EitherString = ...
if let .Value(value) = x {
  println(value)
}
```

Comments

This is also how Rust does "if let", and would be useful indeed: https://github.com/rust-lang/rfcs/pull/160

By AustinZheng at March 18, 2015, 5:15 p.m. (reply...)

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