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lt = [ ... ]
lt.fold(zero: T, op: [(a, b) => a+b])
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reduce(op, [...], [, initializer])
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@fold(lt, zero)
def result(a, b):
...
return res
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def func1():
...
def func2():
...
fold(lt, func1, func2)
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fold(lt, lambda x: func1(x), lambda y: func2(y))
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