NSScreencast Episode #143 Flat Map

Flat Map - NSScreencast

• enum Result<T> {
  • func map<U>(transform: T -> U) -> Result<U> {
• func flatten<T>(array: [[T]]) -> [T]
  • return array.reduce([]) { $0 + $1 }
  • $0などは引数 [Swift] Closureについてメモ - Qiita
  • flatten()
  • ().flattenは難しい
• extension Array {
  • func flatMap<U>(transform: T -> [U]) -> [U]
• infix operator >>== {
  • associativity left
  • func >>==<T, U>(lhs: Result<T>, rhs: (T -> Result<U>)) -> Result<U>
    • let pages = asJSON(data)
      • >>== asJSONArray
• Flattenin' Your Mappenin' - Cocoaphony