Data commit

Task/Partial-function-application/Kotlin/partial-function-application.kotlin

@@ -0,0 +1,28 @@
+// version 1.1.2
+
+typealias Func  = (Int) -> Int
+typealias FuncS = (Func, List<Int>) -> List<Int>
+
+fun fs(f: Func, seq: List<Int>) = seq.map { f(it) }
+
+fun partial(fs: FuncS, f: Func) = { seq: List<Int> -> fs(f, seq) }
+
+fun f1(n: Int) = 2 * n
+
+fun f2(n: Int) = n * n
+
+fun main(args: Array<String>) {
+    val fsf1 = partial(::fs, ::f1)
+    val fsf2 = partial(::fs, ::f2)
+    val seqs = listOf(
+        listOf(0, 1, 2, 3),
+        listOf(2, 4, 6, 8)
+    )
+    for (seq in seqs) {
+        println(fs(::f1, seq))      // normal
+        println(fsf1(seq))          // partial
+        println(fs(::f2, seq))      // normal
+        println(fsf2(seq))          // partial
+        println()
+    }
+}