1 files changed, 23 insertions, 16 deletions

diff --git a/javascripts/Stack.js b/javascripts/Stack.js
index 808dea9..c4e2db9 100644
--- a/javascripts/Stack.js
+++ b/javascripts/Stack.js
@@ -3,46 +3,53 @@
  *
  */
 function Stack() {
-	this.a = new Array();
+	this.a 		= new Array();
 	this.length = 0;
-}
+};
 
+// 
 Stack.prototype.push = function(obj) {
 	this.a.push(obj);
 	this.length++;
-}
+};
 
+// 
 Stack.prototype.pop = function() {
 	if (this.isEmpty()) {
-		throw('Pop from empty stack.');
-	}
+		throw('Stack.pop(): Pop from empty stack.');
+	};
 	this.length--;
 	return this.a.pop();
-}
+};
 
+// 
 Stack.prototype.isEmpty = function() {
 	if (this.length == 0) {
 		return true;
-	}
+	};
 	return false;
-}
+};
 
+// 
 Stack.prototype.get = function(index) {
 	return this.a[index];
-}
+};
 
+// 
 Stack.prototype.copy = function() {
 	var c = ((new Array()).concat(this.a));
 	var ret = new Stack();
 	ret.a = c;
 	ret.length = this.length;
 	return ret;
-}
+};
 
-Stack.prototype.str = function() {
-	ret = '';
+// 
+Stack.prototype.str = function(separator) {
+	if (!separator) { separator=' ' };
+	var a = new Array();
 	for (var i=0; i < this.length; i++) {
-		ret += this.a[i].id + ' ';
-	}
-	return ret;
-}
+		a.push(this.a[i].id);
+	};
+	return a.join(separator);
+};