refactored the pickColors method

app/assets/javascripts/monitoring/utils/multiple_time_series.js

@@ -10,8 +10,11 @@ const defaultColorPalette = {
 };
 
 const defaultColorOrder = ['blue', 'orange', 'red', 'green', 'purple'];
-let usedColors = [];
-function pickColor(name) {
+
+export default function createTimeSeries(queryData, graphWidth, graphHeight, graphHeightOffset) {
+  let usedColors = [];
+
+  function pickColor(name) {
     let pick;
     if (name && defaultColorPalette[name]) {
       pick = name;
@@ -26,9 +29,8 @@ function pickColor(name) {
     }
     usedColors.push(pick);
     return defaultColorPalette[pick];
-}
+  }
 
-export default function createTimeSeries(queryData, graphWidth, graphHeight, graphHeightOffset) {
   const maxValues = queryData.result.map((timeSeries, index) => {
     const maxValue = d3.max(timeSeries.values.map(d => d.value));
     return {
@@ -45,6 +47,7 @@ export default function createTimeSeries(queryData, graphWidth, graphHeight, gra
     let metricTag = '';
     let lineColor = '#1f78d1';
     let areaColor = '#8fbce8';
+
     const timeSeriesScaleX = d3.time.scale()
       .range([0, graphWidth - 70]);