Holiday II - Plane Seating

holiday-ii-plane-seating/index.js

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+// https://www.codewars.com/kata/holiday-ii-plane-seating/javascript
+
+function planeSeat(a) {
+  const m = a.match(/^(\d+)(\w+)$/);
+  const v = conditionalRange(+m[1], [
+    { min: 1, max: 20, data: 'Front' },
+    { min: 21, max: 40, data: 'Middle' },
+    { min: 41, max: 60, data: 'Back' },
+  ], false);
+  const h = conditionalRange('ABCDEFGHK'.indexOf(m[2]), [
+    { min: 0, max: 2, data: 'Left' },
+    { min: 3, max: 5, data: 'Middle' },
+    { min: 6, max: 8, data: 'Right' },
+  ], false);
+  return v && h ? [v, h].join`-` : 'No Seat!!';
+}
+
+// https://gist.github.com/gkucmierz/66ed209add3343db76482040d93d8a03
+const conditionalRange = (n, ranges, def) => {
+  for (let i = 0; i < ranges.length; ++i) {
+    const r = ranges[i];
+    if ('max' in r) {
+      if ('min' in r) {
+        if (r.min <= n && n <= r.max) return r.data;
+      } else {
+        if (n <= r.max) return r.data;
+      }
+    }
+  }
+  for (let i = ranges.length-1; 0 <= i; --i) {
+    const r = ranges[i];
+    if ('min' in r) {
+      if (!('max' in r)) {
+        if (r.min <= n) return r.data;
+      }
+    }
+  }
+  return def;
+};