Initial data commit

Task/100-doors/JavaScript/100-doors-9.js

@@ -0,0 +1,29 @@
+(function (n) {
+
+
+    // ONLY PERFECT SQUARES HAVE AN ODD NUMBER OF INTEGER FACTORS
+    // (Leaving the door open at the end of the process)
+
+    return perfectSquaresUpTo(n);
+
+
+    // perfectSquaresUpTo :: Int -> [Int]
+    function perfectSquaresUpTo(n) {
+        return range(1, Math.floor(Math.sqrt(n)))
+            .map(x => x * x);
+    }
+
+
+    // GENERIC
+
+    // range(intFrom, intTo, optional intStep)
+    // Int -> Int -> Maybe Int -> [Int]
+    function range(m, n, step) {
+        let d = (step || 1) * (n >= m ? 1 : -1);
+
+        return Array.from({
+            length: Math.floor((n - m) / d) + 1
+        }, (_, i) => m + (i * d));
+    }
+
+})(100);