refactor: use const for shuffled in getRandomSubarray function

Author: danmarshall

src/views/DataThread.tsx

@@ -385,7 +385,8 @@ export const DataThread: FC<{}> = function ({ }) {
                 return x - Math.floor(x);
             }
             const getRandomSubarray = (arr: any[], size: number) => {
-                let shuffled = arr.slice(0), i = arr.length, temp, index;
+                const shuffled = arr.slice(0);
+                let i = arr.length, temp, index;
                 while (i--) {
                     index = Math.floor((i + 1) * getRandom(233 * i + 888));
                     temp = shuffled[index];

src/views/EncodingShelfThread.tsx

@@ -94,7 +94,8 @@ export const ChartElementFC: FC<{chart: Chart, tableRows: any[], boxWidth?: numb
             return x - Math.floor(x);
         }
         const getRandomSubarray = (arr: any[], size: number) => {
-            let shuffled = arr.slice(0), i = arr.length, temp, index;
+            const shuffled = arr.slice(0);
+            let i = arr.length, temp, index;
             while (i--) {
                 index = Math.floor((i + 1) * getRandom(233 * i + 888));
                 temp = shuffled[index];