Scala Extractors

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Scala Tutorial

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Scala TutorialScala IntroductionScala Installation and Environment ConfigurationScala Basic SyntaxScala Data TypesScala Literals Scala Escape Characters Scala VariablesScala Access ModifiersScala OperatorsScala IF...ELSE StatementsScala LoopsScala Methods and FunctionsScala ClosuresScala StringsScala ArraysScala CollectionScala IteratorScala Classes and ObjectsScala TraitScala Pattern MatchingScala Regular ExpressionsScala Exception HandlingScala ExtractorScala File I/O

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Scala Exception Handling

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Scala File I/O

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Scala Extractor

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An extractor extracts the parameters used to construct an object from the object passed to it.

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The Scala standard library contains some predefined extractors, and we will briefly look at them.

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A Scala extractor is an object with an unapply method. The unapply method is the reverse operation of the apply method: unapply takes an object and then extracts values from it, which are usually the values used to construct the object.

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The following example demonstrates an extractor object for email addresses:

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Example

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object Test {\n\n   def main(args: Array) {\n\n      println ("Apply Method : " + apply("Zara", "gmail.com"));\n\n      println ("Unapply Method : "