Data commit

Task/Combinations/JavaScript/combinations-3.js

@@ -0,0 +1,29 @@
+(function () {
+
+  function comb(n, lst) {
+    if (!n) return [[]];
+    if (!lst.length) return [];
+
+    var x = lst[0],
+        xs = lst.slice(1);
+
+    return comb(n - 1, xs).map(function (t) {
+      return [x].concat(t);
+    }).concat(comb(n, xs));
+  }
+
+
+  // [m..n]
+  function range(m, n) {
+    return Array.apply(null, Array(n - m + 1)).map(function (x, i) {
+      return m + i;
+    });
+  }
+
+  return comb(3, range(0, 4))
+
+    .map(function (x) {
+      return x.join(' ');
+    }).join('\n');
+
+})();