Type Aliases in Kotlin

This post was originally posted at https://agrawalsuneet.github.io/blogs/type-aliases-in-kotlin/ and reposted on Medium on 23rd Dec 2018.
typealias DemoCustomView =
com.agrawalsuneet.demoapp.common.customviews.View
val demoView = DemoCustomView(context)
val demoView = 
com.agrawalsuneet.demoapp.common.customviews.View(context)
typealias MapIntToList = HashMap<Int, List<String>>
val map = MapIntToList()
typealias MapIntToTemplate<T> = HashMap<Int, T>//and then to use itval stringMap = MapIntToTemplate<String>()
val mapOfLists = MapIntToTemplate<List<Int>>()
class DemoClass {    interface ViewHolderCallback

inner class CustomViewHolder
}
typealias ViewHolderCallbackInner = com.agrawalsuneet.demoapp.common.DemoClass.ViewHolderCallback

typealias CustomViewHolderInner = com.agrawalsuneet.demoapp.common.DemoClass.CustomViewHolder

//another example
typealias AndroidColors = android.R.color
typealias ProjectColors = R.color
ContextCompat.getColor(this, ProjectColors.colorPrimary)
ContextCompat.getColor(this, AndroidColors.black)
typealias Conditional<T> = (T) -> Booleanval oddFilter: Conditional<Int> = { it % 2 == 1 }print(listOf(1, 2, 3, 4).filter(oddFilter))//orval fourDigitFilter : Conditional<String> = { it.length == 4}print(listOf("abc", "abcd", "abcde").filter(fourDigitFilter))

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https://agrawalsuneet.github.io/

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Suneet Agrawal

Suneet Agrawal

https://agrawalsuneet.github.io/

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