How to investigate objects/types/etc. from Scala REPL?

Question

I\'ve been working with Scala for a while now and have written a 10,000+ line program with it, but I\'m still confused by some of the inner workings. I came to Scala from Py

Answer 1

Note that scala 2.11.8 New tab-completion in the Scala REPL can facilitate the type exploration/discovery.

It now includes:

• CamelCase completion:
  try:
  (l: List[Int]).rroTAB,
  it expands to:
  (l: List[Int]).reduceRightOption

• Find members by typing any CamelCased part of the name:
  try:
  classOf[String].typTAB, to get getAnnotationsByType, getComponentType and others

• Complete bean getters without typing get:
  try:
  (d: java.util.Date).dayTAB

• Press TAB twice to see the method signature:
  try:
  List(1,2,3).partTAB,
  which completes to:
  List(1,2,3).partition;
  press TAB again to display:
  def partition(p: Int => Boolean): (List[Int], List[Int])