Data update

Task/Fibonacci-word/Dart/fibonacci-word.dart

@@ -0,0 +1,59 @@
+import 'dart:math';
+
+class FWord {
+  String fWord0 = "";
+  String fWord1 = "";
+
+  String nextFWord() {
+    String result;
+
+    if (fWord1 == "") {
+      result = "1";
+    } else if (fWord0 == "") {
+      result = "0";
+    } else {
+      result = fWord1 + fWord0;
+    }
+
+    fWord0 = fWord1;
+    fWord1 = result;
+
+    return result;
+  }
+
+  static double entropy(String source) {
+    int length = source.length;
+    var counts = <String, int>{};
+    double result = 0.0;
+
+    for (int i = 0; i < length; i++) {
+      String c = source[i];
+
+      if (counts.containsKey(c)) {
+        counts[c] = counts[c] + 1;
+      } else {
+        counts[c] = 1;
+      }
+    }
+
+    counts.values.forEach((count) {
+      double proportion = count / length;
+      result -= proportion * (log(proportion) / log(2));
+    });
+
+    return result;
+  }
+
+  static void main() {
+    FWord fWord = FWord();
+
+    for (int i = 0; i < 37;) {
+      String word = fWord.nextFWord();
+      print("${++i} ${word.length} ${entropy(word)}");
+    }
+  }
+}
+
+void main() {
+  FWord.main();
+}