Update rand.js

lib/rand.js

@@ -5,11 +5,43 @@ function getInt(min, max) {
 }
 
 function one(arr) {
-	return arr[getInt(0, arr.length - 1)];
+    return arr[getInt(0, arr.length - 1)];
+}
+
+function makeString(length, characterNames) {
+    var result           = '';
+    var characters       = '';
+    
+    for (var i = 0; i < characterNames.length; i++) {
+        switch (characterNames[i]) {
+            case 'uppercase':
+                characters += 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+                break;
+                
+            case 'lowercase':
+                characters += 'abcdefghijklmnopqrstuvwxyz';
+                break;
+
+            case 'number':
+                characters += '0123456789';
+                break;
+
+            default:
+                characters += characterNames[i];
+        }
+    }
+
+    var charactersLength = characters.length;
+    for ( var i = 0; i < length; i++ ) {
+        result += characters.charAt(Math.floor(Math.random() * charactersLength));
+    }
+
+    return result;
 }
 
 exports.getInt = getInt;
 exports.one = one;
+exports.makeString = makeString;
 
 exports.VERSIONINFO = "Random Module (random.js) version 0.1";
 exports.global = global;