Department numbers: Difference between revisions

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@@ Line 2,293: / Line 2,293: @@
 Briefly:
 <lang JavaScript>(() => {
+    "use strict";
+    const
-    // concatMap :: (a -> [b]) -> [a] -> [b]
+        label = "(Police, Sanitation, Fire)",
-    const concatMap = (f, xs) => [].concat.apply([], xs.map(f));
+        solutions = [2, 4, 6]
+        .flatMap(
-    return '(Police, Sanitation, Fire)\n' +
-        concatMap(x =>
+            x => [1, 2, 3, 4, 5, 6, 7]
-            concatMap(y =>
+            .flatMap(
-                concatMap(z =>
+                y => [12 - (x + y)]
-                    z !== y && 1 <= z && z <= 7 ? [
+                .flatMap(
+                    z => z !== y && 1 <= z && z <= 7 ? [
                         [x, y, z]
-                    ] : [], [12 - (x + y)]
+                    ] : []
-                ), [1, 2, 3, 4, 5, 6, 7]
+                )
-            ), [2, 4, 6]
+            )
         )
         .map(JSON.stringify)
-        .join('\n');
+        .join("\n");
+    return `${label}\n${solutions}`;
 })();</lang>
 {{Out}}