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Event-listener setters should have signature onClick[U](f: View ⇒ U) instead of onClick(f: View ⇒ Unit) #78

nadavwr opened this Issue Feb 28, 2014 · 1 comment


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nadavwr commented Feb 28, 2014

I find myself adding superfluous unit literals at the end of event handlers.

Compare the following two examples:

Using Scaloid's onClick:

button.onClick {
  dir.mkdir() // ← returns Boolean, not Unit
  () // ← boilerplate required to conform with Unit result type

Compared to trivial usage of Scala's foreach:

dirs.foreach { dir ⇒
  dir.mkdir() // ← returns Boolean, which is discarded

The latter is preferable.

This is really easy to implement, as seen from foreach's definition:

def foreach[U](f: A ⇒ U): Unit

Where U clearly stands for Unit, but is actually more liberal.

Applying this to (e.g.) 'onClick', the signature would look like so:

def onClick[U](f: View ⇒ U)

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pocorall Mar 23, 2014


Good suggestion, thanks!
I am working on this issue.


pocorall commented Mar 23, 2014

Good suggestion, thanks!
I am working on this issue.

@pocorall pocorall closed this in 7a8f702 Mar 23, 2014

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