Another update from ingydotnet^djgoku

Task/Sierpinski-carpet/JavaScript/sierpinski-carpet-2.js

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+// Orders 1, 2 and 3 of the Sierpinski Carpet
+// as lines of text.
+
+// Generic text output for use in any JavaScript environment
+// Browser JavaScripts may use console.log() to return textual output
+// others use print() or analogous functions.
+
+[1, 2, 3].map(function sierpinskiCarpetOrder(n) {
+
+    // An (n * n) grid of (filled or empty) sub-rectangles
+    // n --> [[s]]
+    var carpet = function (n) {
+            var lstN = range(0, Math.pow(3, n) - 1);
+
+            // State of each cell in an N * N grid
+            return lstN.map(function (x) {
+                return lstN.map(function (y) {
+                    return inCarpet(x, y);
+                });
+            });
+        },
+
+        // State of a given coordinate in the grid:
+        // Filled or not ?
+        // (See https://en.wikipedia.org/wiki/Sierpinski_carpet#Construction)
+        // n --> n --> bool
+        inCarpet = function (x, y) {
+            return (!x || !y) ? true :
+                !(
+                    (x % 3 === 1) &&
+                    (y % 3 === 1)
+                ) && inCarpet(
+                    x / 3 | 0,
+                    y / 3 | 0
+                );
+        },
+
+        // Sequence of integers from m to n
+        // n --> n --> [n]
+        range = function (m, n) {
+            return Array.apply(null, Array(n - m + 1)).map(
+                function (x, i) {
+                    return m + i;
+                }
+            );
+        };
+
+    // Grid of booleans mapped to lines of characters
+    // [[bool]] --> s
+    return carpet(n).map(function (line) {
+        return line.map(function (bool) {
+            return bool ? '\u2588' : ' ';
+        }).join('');
+    }).join('\n');
+
+}).join('\n\n');