Data commit

Task/Middle-three-digits/Wren/middle-three-digits.wren

@@ -0,0 +1,19 @@
+import "/fmt" for Fmt
+
+var middle3 = Fn.new { |n|
+    if (n < 0) n = -n
+    var s = "%(n)"
+    var c = s.count
+    if (c < 3) return "Minimum is 3 digits, only has %(c)."
+    if (c%2 == 0) return "Number of digits must be odd, %(c) is even."
+    if (c == 3) return s
+    var d = (c - 3)/2
+    return s[d..d+2]
+}
+
+var a = [123, 12345, 1234567, 987654321, 10001, -10001, -123, -100, 100, -12345,
+    1, 2, -1, -10, 2002, -2002, 0]
+
+for (e in a) {
+    System.print("%(Fmt.s(9, e)) -> %(middle3.call(e))")
+}