CODEWITHSUNDEEP
scala
Kedar Parikh
Kedar Parikh

Reputation: 877

how to iterate over the properties of object in scala?

Is there some way i can iterate over the properties of object and get the name and value both while iterating. I know about the product iterator, but using that I only get the property value not the name of the property at the same time.

Upvotes: 1

Views: 7694

Answers (3)

jazmit
jazmit

Reputation: 5420

Unless you are building tooling for programmers developing scala, it is very probable that you should be using a Map instead of an object.

eg:

val myObject: Map[String, Any] =
  Map("prop1" -> 1, "prop2" -> "string", "prop3" -> List(1, 2, 3))

for ((key, value) <- myObject) {
  println(key, value)
}

If you are building tooling or you can't just swap out the object for a map, you can use reflection as mentioned in the other answers.

Upvotes: 3

Erik Kaplun
Erik Kaplun

Reputation: 38257

Just don't do it!

Use another design: Scala is not PHP or Python or Perl; it's a statically typed functional language with a very expressive type system; such reflection (runtime inspection) is not needed 99.9% of the time and should be avoided for reasons of safety, correctness and performance.

Upvotes: 2

codejitsu
codejitsu

Reputation: 3182

I think, there is no way to do it without using reflection. (See for example here: Getting public fields (and their respective values) of an Instance in Scala/Java)

An other option is using Apache FieldUtils: https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/reflect/FieldUtils.html But again it uses reflection in background.

Upvotes: 1

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