fix(bar,summary,xyplot): safely stringify null and undefined cells wh…

…en finding unique values

Previously, there would be runtime errors if users switched to columns with cell values that lacked
a toString() method

BREAKING CHANGE: App does not crash when columns contain cell values that do not have toString()
inside, such as "undefined" or "null"

src/charts/bar.tsx

@@ -5,7 +5,7 @@ import TooltipContent, { safeDisplayValue } from "../utilities/tooltip-content";
 import { numeralFormatting } from "../utilities/utilities";
 
 import * as Dx from "../utilities/types";
-import { sortByOrdinalRange } from "./shared";
+import { sortByOrdinalRange, getUniqueValues } from "./shared";
 
 interface BarOptions {
   selectedDimensions: string[];
@@ -112,15 +112,7 @@ export const semioticBarChart = (
     };
   }
 
-  const uniqueValues = sortedData.reduce(
-    (uniques, datapoint) =>
-      !uniques.find(
-        (uniqueDimName: string) => uniqueDimName === datapoint[dim1].toString(),
-      )
-        ? [...uniques, datapoint[dim1].toString()]
-        : uniques,
-    [],
-  );
+  const uniqueValues = dim1 === "none" ? [] : getUniqueValues(sortedData, dim1);
 
   if (!colorHashOverride && dim1 && dim1 !== "none") {
     uniqueValues.forEach((value: string, index: number) => {

src/charts/shared.tsx

@@ -20,7 +20,7 @@ export const sortByOrdinalRange = (
   rAccessor: string | (() => void),
   secondarySort: string,
   data: Dx.DataProps["data"],
-): any[] => {
+): Dx.DataProps["data"] => {
   const subsortData: { [index: string]: SubsortObject } = {};
   let subsortArrays: SubsortObject[] = [];
   data.forEach((datapoint) => {
@@ -65,3 +65,22 @@ export const sortByOrdinalRange = (
     [],
   );
 };
+
+/*
+  Returns uniques values in a column as strings
+  Safely stringifies different data types, including null/undefined.
+*/
+export const getUniqueValues = (
+  points: Dx.DataProps["data"],
+  accessor: string,
+): string[] => {
+  return [
+    ...new Set(
+      points.map((d) => {
+        const value = d[accessor];
+        // Don't call stringify on a string, as it will add "quote" marks around your value.
+        return typeof value === "string" ? value : JSON.stringify(value);
+      }),
+    ),
+  ];
+};

src/charts/summary.tsx

@@ -5,6 +5,7 @@ import HTMLLegend from "../components/HTMLLegend";
 import TooltipContent, { safeDisplayValue } from "../utilities/tooltip-content";
 import * as Dx from "../utilities/types";
 import { numeralFormatting } from "../utilities/utilities";
+import { getUniqueValues } from "./shared";
 
 interface SummaryOptions {
   chart: Dx.Chart;
@@ -37,14 +38,7 @@ export const semioticSummaryChart = (
 
   const rAccessor = metric1;
 
-  const uniqueValues = data.reduce(
-    (uniqueArray: string[], datapoint) =>
-      (!uniqueArray.find(
-        (dimValue: string) => dimValue === datapoint[dim1].toString(),
-      ) && [...uniqueArray, datapoint[dim1].toString()]) ||
-      uniqueArray,
-    [],
-  );
+  const uniqueValues = dim1 === "none" ? [] : getUniqueValues(data, dim1);
 
   if (!colorHashOverride && dim1 && dim1 !== "none") {
     uniqueValues.sort().forEach((dimValue, index) => {

src/charts/xyplot.tsx

@@ -7,7 +7,7 @@ import TooltipContent from "../utilities/tooltip-content";
 import { numeralFormatting } from "../utilities/utilities";
 
 import * as Dx from "../utilities/types";
-import { sortByOrdinalRange } from "./shared";
+import { sortByOrdinalRange, getUniqueValues } from "./shared";
 
 import styled from "styled-components";
 
@@ -253,14 +253,7 @@ export const semioticXYPlot = (
     dim1 &&
     dim1 !== "none"
   ) {
-    const uniqueValues = sortedData.reduce(
-      (uniqueArray, datapoint) =>
-        (!uniqueArray.find(
-          (uniqueDim: string) => uniqueDim === datapoint[dim1].toString(),
-        ) && [...uniqueArray, datapoint[dim1].toString()]) ||
-        uniqueArray,
-      [],
-    );
+    const uniqueValues = getUniqueValues(sortedData, dim1);
 
     if (!colorHashOverride) {
       uniqueValues.sort().forEach((dimValue: string, index: number) => {