Collections operations: How to determine the iteration?

Question
1

Let’s say we are filtering a list of strings and want to create a log entry if a string has been filtered out:

val strings = IndexedSeq("foo", "", "bar")

val filtered = strings.filter(string => {
  if (string.isEmpty) {
    logger.trace("value ignored")
    false
  } else {
    true
  }
})

What is the best way to find out which element of the sequence has been ignored to add this information to the logfile?

2

In what way the code you posted is not good enough?

1 Like
3

I want to have the logging message: value 1 ignored.

4

you can use zipWithIndex to get an index value pair

2 Likes