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Predicate methods allow you to separate the criteria you're using to test items in a collection from the code that processes the collection. You may never write a For...Each loop again. Here are some ...

Happy is the main lexical predicate here. It takes one argument: an experiencer--John. Tall takes one argument: a theme: Mary. (12) *John is being tall. (13) *Mary is being fond of red roses. (14) ...

While passing objects as arguments is a standard and familiar way to invoke methods, providing methods as arguments to other methods is less so. Nonetheless, we often must pass a method as a parameter ...