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eyelash/io.kt

Created January 6, 2019 17:20
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io.kt
typealias IO<T> = () -> T
fun getChar(): IO<Char> {
return {
'x'
}
}
fun putChar(c: Char): IO<Unit> {
return {
print(c)
}
}
fun <T, U> IO<T>.bind(f: (T) -> IO<U>): IO<U> {
return {
f(this())()
}
}
fun _main(): IO<Unit> {
return getChar().bind { c ->
putChar(c).bind {
putChar(c)
}
}
}
fun main() {
_main()()
}
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