课程: Programming Foundations: Design Patterns

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The iterator pattern as language feature

The iterator pattern as language feature

课程: Programming Foundations: Design Patterns

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The iterator pattern as language feature

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- [Instructor] The iterator pattern is one of those patterns that is so useful it's become built-in to languages as language features. Languages provide built-in iterators as we saw with Java collections and they use iterators in language statements too. These statements hide the iterator pattern and it's iterators behind the scenes and make it easy to iterate through collections of values. Java, Python and JavaScript all have statements that use the iterator pattern behind the scenes. Java's enhanced for statement is designed for iteration through collections and arrays. So this code will work whether animals is an ArrayList of animal objects or an array of animal objects. Python's for/in statement can be used with any iterable aggregate object such as string, list and tuple and JavaScript's for/of statement can be used with strings, arrays, maps and sets. All of which are iterable objects meaning there are iterators…

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