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map/reduce #5

@makisang

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@makisang
  • map传入的第一个参数是一个函数对象,结果是一个Iterator

  • reduce把一个函数作用于一个序列[x1, x2, x3, ...]上,而这个函数必须接收两个参数,reduce把结果继续和序列的下一个元素做累积计算,效果类似于:

    reduce(f, [x1, x2, x3, x4]) = f(f(f(x1, x2), x3), x4)

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