Comments on: Top 5 Things to Know About Constructors in Scala

By: Knowtu » links for 2010-01-08

Knowtu » links for 2010-01-08 — Sat, 09 Jan 2010 01:30:16 +0000

[...] Code Monkeyism: Top 5 Things to Know About Constructors in Scala (tags: scala) [...]

Paul Phillips — Wed, 22 Apr 2009 12:35:28 +0000

Since it took me a long time to figure out it was even possible back in the day, how to have a private primary constructor:

class Foo private (x: Int) { }

eivindw — Wed, 22 Apr 2009 12:11:32 +0000

>To add getBar and setBar but not a public >field you need to:
>
>class Foo(aBar:Bar) {
> @BeanProperty
> private val bar = aBar
>}

For the setter to work I think you should define bar as a var, not val?

private var bar = aBar

Tuomas — Wed, 22 Apr 2009 11:58:30 +0000

The second case is shorter with

class Foo(private val bar: Bar)

or just

class Foo(bar: Bar)

Michael — Wed, 22 Apr 2009 11:41:08 +0000

2. How to have private fields

more concisely:

class Foo(private val bar: Bar) {
…
}

Jesper Nordenberg — Wed, 22 Apr 2009 11:39:22 +0000

Actually you can write “class Foo(private val bar : Bar)”.