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exallium/scan.kt

Created August 10, 2017 15:13
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Quick and Dirty Scan function in Kotlin
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scan.kt
fun <T> List<T>.scan(fn: (T, T) -> T): List<T> {
return if (this.isEmpty()) this
else this.drop(1).fold(listOf(this.first()), { acc, item ->
acc.plus(fn(acc.last(), item))
})
}
println((1..5).toList().scan { x, y -> x + y })
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