Fold
 Usage
Notes
 Further Examples
Here is a definition of the factorial function in functional programming style.
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Here is an implementation of Horner's rule.
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Here Fold is used to give the alternating sum of a list.
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Union with one argument drops duplicates from a list and reorders the remaining elements.
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Here is a function that also drops duplicates from a list but does not reorder the remaining elements. (See the Further Examples for Union for a version which is considerably faster on long lists with many distinct elements.)
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(See the Further Examples for ReplacePart for a powerful application of Fold to partial evaluation of held expressions.)
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