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怎么用
FoldRight实现FoldLeft呢？两个函数的签名如下def foldLeft[A,B]: (List[A], B) => ((B, A) => B) => B def foldRight[A,B]: (List[A], B) => ((A, B) => B) => B
怎么用FoldRight实现FoldLeft呢？两个函数的签名如下
def foldLeft[A,B]: (List[A], B) => ((B, A) => B) => B
def foldRight[A,B]: (List[A], B) => ((A, B) => B) => B