Refactor logic into shared Element method

src/Chart.Bar.js

@@ -275,7 +275,7 @@
 			//Draw all the bars for each dataset
 			helpers.each(this.datasets,function(dataset,datasetIndex){
 				helpers.each(dataset.bars,function(bar,index){
-					if (helpers.isNumber(bar.value)){
+					if (bar.hasValue()){
 						bar.base = this.scale.endPoint;
 						//Transition then draw
 						bar.transition({

src/Chart.Core.js

@@ -873,7 +873,7 @@
 								yMin;
 							helpers.each(this.datasets, function(dataset){
 								dataCollection = dataset.points || dataset.bars || dataset.segments;
-								if (dataCollection[dataIndex] && helpers.isNumber(dataCollection[dataIndex].value)){
+								if (dataCollection[dataIndex] && dataCollection[dataIndex].hasValue()){
 									Elements.push(dataCollection[dataIndex]);
 								}
 							});
@@ -1037,6 +1037,9 @@
 				x : this.x,
 				y : this.y
 			};
+		},
+		hasValue: function(){
+			return isNumber(this.value);
 		}
 	});
 

src/Chart.Line.js

@@ -259,7 +259,7 @@
 				//We can use this extra loop to calculate the control points of this dataset also in this loop
 
 				helpers.each(dataset.points,function(point,index){
-					if (helpers.isNumber(point.value)){
+					if (point.hasValue()){
 						point.transition({
 							y : this.scale.calculateY(point.value),
 							x : this.scale.calculateX(index)
@@ -293,7 +293,7 @@
 				ctx.strokeStyle = dataset.strokeColor;
 				ctx.beginPath();
 				helpers.each(dataset.points,function(point,index){
-					if (helpers.isNumber(point.value)){
+					if (point.hasValue()){
 						if (index>0){
 							if(this.options.bezierCurve){
 								ctx.bezierCurveTo(
@@ -331,7 +331,7 @@
 				//A little inefficient double looping, but better than the line
 				//lagging behind the point positions
 				helpers.each(dataset.points,function(point){
-					if (helpers.isNumber(point.value)){
+					if (point.hasValue()){
 						point.draw();
 					}
 				});