Another update from ingydotnet^djgoku

Task/Fibonacci-word/JavaScript/fibonacci-word.js

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+//makes outputting a table possible in environments
+//that don't support console.table()
+function console_table(xs) {
+    function pad(n,s) {
+        var res = s;
+        for (var i = s.length; i < n; i++)
+            res += " ";
+        return res;
+    }
+
+    if (xs.length === 0)
+        console.log("No data");
+    else {
+        var widths = [];
+        var cells = [];
+        for (var i = 0; i <= xs.length; i++)
+            cells.push([]);
+
+        for (var s in xs[0]) {
+            var len = s.length;
+            cells[0].push(s);
+
+            for (var i = 0; i < xs.length; i++) {
+                var ss = "" + xs[i][s];
+                len = Math.max(len, ss.length);
+                cells[i+1].push(ss);
+            }
+            widths.push(len);
+        }
+        var s = "";
+        for (var x = 0; x < cells.length; x++) {
+            for (var y = 0; y < widths.length; y++)
+                s += "|" + pad(widths[y], cells[x][y]);
+            s += "|\n";
+        }
+        console.log(s);
+    }
+}
+
+//returns the entropy of a string as a number
+function entropy(s) {
+     //create an object containing each individual char
+	//and the amount of iterations per char
+    function prob(s) {
+        var h = Object.create(null);
+        s.split('').forEach(function(c) {
+           h[c] && h[c]++ || (h[c] = 1);
+        });
+        return h;
+    }
+
+    s = s.toString(); //just in case
+    var e = 0, l = s.length, h = prob(s);
+
+    for (var i in h ) {
+        var p = h[i]/l;
+        e -= p * Math.log(p) / Math.log(2);
+    }
+    return e;
+}
+
+//creates Fibonacci Word to n as described on Rosetta Code
+//see rosettacode.org/wiki/Fibonacci_word
+function fibWord(n) {
+    var wOne = "1", wTwo = "0", wNth = [wOne, wTwo], w = "", o = [];
+
+    for (var i = 0; i < n; i++) {
+        if (i === 0 || i === 1) {
+            w = wNth[i];
+        } else {
+            w = wNth[i - 1] + wNth[i - 2];
+            wNth.push(w);
+        }
+        var l = w.length;
+        var e = entropy(w);
+
+        if (l <= 21) {
+        	o.push({
+            	N: i + 1,
+            	Length: l,
+            	Entropy: e,
+            	Word: w
+        	});
+        } else {
+        	o.push({
+            	N: i + 1,
+            	Length: l,
+            	Entropy: e,
+            	Word: "..."
+        	});
+        }
+    }
+
+    try {
+    	console.table(o);
+    } catch (err) {
+    	console_table(o);
+    }
+}
+
+fibWord(37);