Re: Seq :+ repeat parameter

Do you mean that you want to add the same object multiple times with a
repeat parameter? That isn't provided, but a for loop would work.

Or do you mean chaining? You can do the following:

val scalaButs = CanvButton(...) +: CanvButton(...) +: ... +: Nil

Note I used +: You don't want to use :+ with Lists (what Seq.apply()
returns), because appending is O(n). However, appending to Vectors is O(1).

val scalaButs1 = Vector(CanvButton(...))

val scalaButs = scalaButs1 :+ CanvButton(...) :+ ... :+ CanvButton(...)

Dean Wampler, Ph.D.
Author: Programming Scala, 2nd Edition
<http://shop.oreilly.com/product/0636920033073.do> (O'Reilly)
Lightbend <http://lightbend.com>
@deanwampler <http://twitter.com/deanwampler>
http://polyglotprogramming.com

On Thu, Apr 7, 2016 at 7:45 AM, Rich Oliver <[email protected]> wrote:

> I have created the following code and it seems to compile and run
> correctly:
>
> val scaleButs = Seq(CanvButton("+", () => { scale = (scale *
> 1.5).min(scaleMax); repaintMap() }),
>       CanvButton("-", () => { scale = (scale / 1.5).max(scaleMin);
> repaintMap() }))
>    val mapButs = scaleButs :+ (
>       CanvButton("<=", () => { mapFocus = mapFocus.subX(moveInc);
> repaintMap() }),
>       CanvButton("=>", () => { mapFocus = mapFocus.addX(moveInc);
> repaintMap() }),
>       CanvButton("Up", () => { mapFocus = mapFocus.addY(moveInc);
> repaintMap() }),
>       CanvButton("down", () => { mapFocus = mapFocus.subY(moveInc);
> repaintMap() })
>    )
>
> But in the API documentation the :+ doesn't have a repeat parameter. I've
> looked in SeqLike.scala
> https://github.com/scala/scala/blob/v2.11.8/src/library/scala/collection/SeqLike.scala#L1
> and I can't see any repeat parameter for the :+ method there either.
>
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