Function capFirst

src/resolution/swift-objc-bridge.ts:42–44

* Capitalize the first character of a string. Used for the "With"-prefix * form on the first selector keyword when the Swift declaration has an * explicit first-parameter label (e.g. `func play(song:)` → `playWithSong:`).

(s: string)

 * explicit first-parameter label (e.g. `func play(song:)` → `playWithSong:`).
 */
function capFirst(s: string): string {
  return s.length > 0 ? s.charAt(0).toUpperCase() + s.slice(1) : s;
}

/**
 * Lowercase the first character. Used in reverse: `setName:` setter ↔