First commit of partial RosettaCode contents.

Pushing this for testing purposes. Lots of work still needed.

Task/Bulls_and_cows/JavaScript/bulls_and_cows.js

@@ -0,0 +1,88 @@
+#!/usr/bin/env js
+
+function main() {
+    var len = 4;
+    playBullsAndCows(len);
+}
+
+function playBullsAndCows(len) {
+    var num = pickNum(len);
+    // print('The secret number is:\n  ' + num.join('\n  '));
+    showInstructions(len);
+    var nGuesses = 0;
+    while (true) {
+        nGuesses++;
+        var guess = getGuess(nGuesses, len);
+        var census = countBovine(num, guess);
+        showScore(census.bulls, census.cows);
+        if (census.bulls == len) {
+            showFinalResult(nGuesses);
+            return;
+        }
+    }
+}
+
+function showScore(nBulls, nCows) {
+    print('    Bulls: ' + nBulls + ', cows: ' + nCows);
+}
+
+function showFinalResult(guesses) {
+    print('You win!!! Guesses needed: ' + guesses);
+}
+
+function countBovine(num, guess) {
+    var count = {bulls:0, cows:0};
+    var g = guess.join('');
+    for (var i = 0; i < num.length; i++) {
+        var digPresent = g.search(num[i]) != -1;
+        if (num[i] == guess[i]) count.bulls++;
+        else if (digPresent) count.cows++;
+    }
+    return count;
+}
+
+function getGuess(nGuesses, len) {
+    while (true) {
+        putstr('Your guess #' + nGuesses + ': ');
+        var guess = readline();
+        guess = String(parseInt(guess)).split('');
+        if (guess.length != len) {
+            print('  You must enter a ' + len + ' digit number.');
+            continue;
+        }
+        if (hasDups(guess)) {
+            print('  No digits can be duplicated.');
+            continue;
+        }
+        return guess;
+    }
+}
+
+function hasDups(ary) {
+    var t = ary.concat().sort();
+    for (var i = 1; i < t.length; i++) {
+        if (t[i] == t[i-1]) return true;
+    }
+    return false;
+}
+
+function showInstructions(len) {
+    print();
+    print('Bulls and Cows Game');
+    print('-------------------');
+    print('  You must guess the ' + len + ' digit number I am thinking of.');
+    print('  The number is composed of the digits 1-9.');
+    print('  No digit appears more than once.');
+    print('  After each of your guesses, I will tell you:');
+    print('    The number of bulls (digits in right place)');
+    print('    The number of cows (correct digits, but in the wrong place)');
+    print();
+}
+
+function pickNum(len) {
+    var nums = [1, 2, 3, 4, 5, 6, 7, 8, 9];
+    nums.sort(function(){return Math.random() - 0.5});
+    return nums.slice(0, len);
+}
+
+main();