added $tw.utils.pushOnce

retained check for basic each nonetheless

tests pass

boot/boot.js

@@ -84,6 +84,15 @@ $tw.utils.each = function(object,callback) {
 	}
 };
 
+/*
+Pushes a value to an array only when not yet contained.
+*/
+$tw.utils.pushOnce = function(array,value) {
+	if(0 > array.indexOf(value)){
+		array.push(value);
+	}
+}
+
 /*
 Helper for making DOM elements
 tag: tag name

core/modules/filters/each.js

@@ -17,19 +17,17 @@ With suffix "list", selects all tiddlers that are values in a specified list fie
 Export our filter function
 */
 exports.each = function(source,operator,options) {
-	var results = [],
-		values = {},
-		field = operator.operand || "title",
-		add = function(val,title) {
-			if(!$tw.utils.hop(values,val)) {
-				values[val] = true;
-				results.push(title);
-			}
-		};
+	var results =[] ,
+		value,values = {},
+		field = operator.operand || "title";
 	if("list" !== operator.suffix) {
 		source(function(tiddler,title) {
 			if(tiddler) {
-				add("title" === field ? title : tiddler.getFieldString(field),title);
+				value = "title" === field ? title : tiddler.getFieldString(field);
+				if(!$tw.utils.hop(values,value)) {
+					values[value] = true;
+					results.push(title);
+				}
 			}
 		});		
 	} else {
@@ -38,7 +36,7 @@ exports.each = function(source,operator,options) {
 				$tw.utils.each(
 					options.wiki.getTiddlerList(title,field),
 					function(value) {
-						add(value,value);
+						$tw.utils.pushOnce(results,value);
 					}
 				);
 			}