Pattern Matching - Filtering Data With Patterns

Filtering Data With Patterns

Pattern matching can be used to filter data of a certain structure. For instance, in Haskell a list comprehension could be used for this kind of filtering:

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evaluates to

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    To write it, it took three months; to conceive it three minutes; to collect the data in it—all my life.
    F. Scott Fitzgerald (1896–1940)

    For the man who should loose me is dead,
    Fighting with the Duke in Flanders,
    In a pattern called a war.
    Christ! What are patterns for?
    Amy Lowell (1874–1925)