September 2017 Update

Task/SEDOLs/Kotlin/sedols.kotlin

@@ -0,0 +1,25 @@
+// version 1.1.0
+
+val weights = listOf(1, 3, 1, 7, 3, 9, 1)
+
+fun sedol7(sedol6: String): String {
+    if (sedol6.length != 6) throw IllegalArgumentException("Length of argument string must be 6")
+    var sum = 0
+    for (i in 0..5) {
+        val c = sedol6[i]
+        val v = when (c) {
+            in '0'..'9' -> c.toInt() - 48
+            in 'A'..'Z' -> c.toInt() - 55
+            else        -> throw IllegalArgumentException("Argument string contains an invalid character")
+        }
+        sum += v * weights[i]
+    }
+    val check = (10 - (sum % 10)) % 10
+    return sedol6 + (check + 48).toChar()
+}
+
+fun main(args: Array<String>) {
+    val sedol6s = listOf("710889", "B0YBKJ", "406566", "B0YBLH", "228276", "B0YBKL",
+                         "557910", "B0YBKR", "585284", "B0YBKT", "B00030")
+    for (sedol6 in sedol6s) println("$sedol6 -> ${sedol7(sedol6)}")
+}