Question

Hi I want to loop a set of Strings and convert them from String type to ObjectId type.

I tried this way:

followingIds.foreach(e => e = new ObjectId(e))

But I cant do that assignement.

I also tried using “for” but I don’t know how to access each position of the Set by Index.

for (i <- 0 until following.size) {
   following[i] = new ObjectId(following[i])
}

This neither work,

Can anyone help me?!? Please!

Answer 1

If you insist on mutability you can go with something like this:

var followingIds = Set("foo", "bar")
followingIds = followingIds.map(e => new ObjectId(e))

But you can make your code more scalish with immutable things:

val followingIds = Set("foo", "bar")
val objectIds = followingIds.map(e => new ObjectId(e))

Now variables (values) names are pretty descriptive