KentarouKanno/Method Chain.md

## Method Chain.md

      
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              Method Chain.md
            
          
    Method Chain

Swiftでメソッドチェーンを実装する
class Object {
    
    var val = 0
    
    init() {}
    
    @discardableResult
    func chain() -> Object {
        self.val += 1
        return self
    }
}

let obj = Object()
print(obj.val)
//=> 0
        
let o = obj.chain().chain().chain()
print(o.val)
//=> 3