I need change it to more clear Do you have some good example kotlinlang #getting-started

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Title

l

leonardootto

08/21/2017, 1:32 PM

I need change it to more clear. Do you have some good examples of property extension?

k

karelpeeters

08/21/2017, 1:35 PM

I recently did this:

inline val Long.sign
    get() = when {
        this > 0L -> 1
        this < 0L -> -1
        else -> 0
    }

inline val Long.abs
    get() = Math.abs(this)

Turns out something like this was added in the latest version too, but I haven't updated yet.

I don't think I've come across a use for extension `var`s yet.

l

leonardootto

08/21/2017, 1:47 PM

Good. Thanks Karel. I try find some example using property extension with var. Maybe i will back to StringBuffer property extension, is more simple to understand.

🙂

b

benleggiero

08/21/2017, 1:50 PM

@karelpeeters I use them for specialized dictionaries:

inline var Map<String, MyKey>.isStarted: Boolean
    get() = this["isStarted"].booleanValue
    set(newValue: Boolean) = this["isStarted"] = MyKey(booleanValue = newValue)

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