var_dump() in Scala

Question

Is there any convenient way to dump all members of a specified object in Scala,
like var_dump(), PHP function?

Answer 1

As mentioned in "How to Dump/Inspect Object or Variable in Java" (yes, I know, the question is about Scala):

Scala (console) has a very useful feature to inspect or dump variables / object values :

scala> def b = Map("name" -> "Yudha", "age" -> 27)
b: scala.collection.immutable.Map[java.lang.String,Any]

scala> b
res1: scala.collection.immutable.Map[java.lang.String,Any] = Map((name,Yudha), (age,27))

But if you want more details, you can give REPL Scala Utils a try, in order to get a "Easier object inspection in the Scala REPL"

So I've written a utility for use on the Scala REPL that will print out all of the "attributes" of an object.

(Note: "I" being here: Erik Engbrecht, also on BitBucket)

Here's some sample usage:

scala> import replutils._
import replutils._

scala> case class Test(a: CharSequence, b: Int)
defined class Test

scala> val t = Test("hello", 1)
t: Test = Test(hello,1)

scala> printAttrValues(t)
hashCode: int = -229308731
b: int = 1
a: CharSequence (String) = hello
productArity: int = 2
getClass: Class = class line0$object$$iw$$iw$Test

That looks fairly anti-climatic, but after spending hours typing objName to see what's there, and poking at methods, it seems like a miracle.
Also, one neat feature of it is that if the class of the object returned is different from the class declared on the method, it prints both the declared class and the actual returned class.

Answer 2

You might want to look at ToStringBuilder in commons-lang, specificly ToStringBuilder.reflectionToString().