Initial data commit

Task/Hofstadter-Figure-Figure-sequences/JavaScript/hofstadter-figure-figure-sequences.js

@@ -0,0 +1,47 @@
+var R = [null, 1];
+var S = [null, 2];
+
+var extend_sequences = function (n) {
+	var current = Math.max(R[R.length-1],S[S.length-1]);
+	var i;
+	while (R.length <= n || S.length <= n) {
+		i = Math.min(R.length, S.length) - 1;
+		current += 1;
+		if (current === R[i] + S[i]) {
+			R.push(current);
+		} else {
+			S.push(current);
+		}
+	}
+}
+
+var ffr = function(n) {
+	extend_sequences(n);
+	return R[n];
+};
+
+var ffs = function(n) {
+	extend_sequences(n);
+	return S[n];
+};
+
+for (var i = 1; i <=10; i += 1) {
+   console.log('R('+ i +') = ' + ffr(i));
+}
+
+var int_array = [];
+
+for (var i = 1; i <= 40; i += 1) {
+	int_array.push(ffr(i));
+}
+for (var i = 1; i <= 960; i += 1) {
+	int_array.push(ffs(i));
+}
+
+int_array.sort(function(a,b){return a-b;});
+
+for (var i = 1; i <= 1000; i += 1) {
+	if (int_array[i-1] !== i) {
+		throw "Something's wrong!"
+	} else { console.log("1000 integer check ok."); }
+}