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In functional programming, fold, also known variously as reduce, accumulate, compress or inject, is a family of higher-order functions that process a data structure in some order and build up a return value. Typically, a fold deals with two things: a combining function and a data structure, typically a list of elements. The fold then proceeds to combine elements of the data structure using the function in some systematic way.Folds are in a sense dual to unfolds, which take a starting value of some other type and apply a function recursively to decide how to construct a data structure, whereas…mehr

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In functional programming, fold, also known variously as reduce, accumulate, compress or inject, is a family of higher-order functions that process a data structure in some order and build up a return value. Typically, a fold deals with two things: a combining function and a data structure, typically a list of elements. The fold then proceeds to combine elements of the data structure using the function in some systematic way.Folds are in a sense dual to unfolds, which take a starting value of some other type and apply a function recursively to decide how to construct a data structure, whereas a fold recursively breaks that structure down, replacing it with other functions and values.