CODEWITHSUNDEEP
scala
lex82
lex82

Reputation: 11297

How to call a Scala function with a single parameter and write the parameter first

I have some code that converts the elements of sequences with different functions like that:

someSequence map converterFunction

However, sometimes I have not a sequence but a single value that is to be passed to the function. For consistency with the other lines I'd like to write it like that

someValue applyTo converterFunction

So in a way it is like mapping a single value. Of course I can just call the function with the value, I'm just wondering if it is possible to write it similar to the way I proposed.

Upvotes: 0

Views: 105

Answers (2)

SergGr
SergGr

Reputation: 23788

I agree with ChrisK that this idea doesn't sound as a good one to me in terms of code readability but if you really want it, you can do it using something like this:

implicit final class MapAnyOp[T](val value: T) extends AnyVal {
  def map[R](f: T => R) = f(value)
}

def convert(v: Int): String = Integer.toHexString(v)

println(List(123, 234, 345) map convert)
println(123 map convert)

Upvotes: 2

Nicolas Cailloux
Nicolas Cailloux

Reputation: 448

You could wrap it in a Seq: 

Seq(someValue) map converterFunction

If someValue is a custom type/class, you can define an operator that will do that for you instead of having this explicit wrapping.

someValue.seq map converterFunction

Upvotes: 1

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