Comprehensions have the form for (enumerators) yield e, where enumerators refers to a semicolon-separated list of enumerators.
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Sequence Comprehensions - Scala Documentation
Scala offers a lightweight notation for expressing sequence comprehensions. <span>Comprehensions have the form for (enumerators) yield e, where enumerators refers to a semicolon-separated list of enumerators. An enumerator is either a generator which introduces new variables, or it is a filter. A comprehension evaluates the body e for each binding generated by the enumerators and returns a se
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