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This Java answer (and this one) uses a lambda that does not explicitly declare its parameter type, but this Scala answer includes a parameter type. in both cases, the type could be inferred when it is assigned to a variable. For example, for a lambda that takes an int and returns an int:

Function<Integer, Integer> f = a->... // Java
val f: Int => Int = a=>... // Scala

My question is: should the type parameters be included in the lambda, or can we assume that they are declared as above?


marked as duplicate by Poke, Mego, Nathan Merrill, Matthew Roh, mbomb007 Mar 21 '17 at 16:13

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  • \$\begingroup\$ Is there any problem with being able to handle more input types than mandated by the spec? \$\endgroup\$ – John Dvorak Mar 21 '17 at 15:29
  • \$\begingroup\$ @JanDvorak what do you mean? \$\endgroup\$ – Brian McCutchon Mar 21 '17 at 15:46
  • \$\begingroup\$ @Poke I think that answers it. \$\endgroup\$ – Brian McCutchon Mar 21 '17 at 15:50

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