Added sorting helper functions for Table Header

src/components/Table/sorting.js

@@ -0,0 +1,30 @@
+// @flow
+const desc = (a, b, orderBy) => {
+  if (b[orderBy] < a[orderBy]) {
+    return -1
+  }
+  if (b[orderBy] > a[orderBy]) {
+    return 1
+  }
+  return 0
+}
+
+export const stableSort = (array: any, cmp: any) => {
+  const stabilizedThis = array.map((el, index) => [el, index])
+
+  stabilizedThis.sort((a, b) => {
+    const order = cmp(a[0], b[0])
+    if (order !== 0) {
+      return order
+    }
+
+    return a[1] - b[1]
+  })
+
+  return stabilizedThis.map(el => el[0])
+}
+
+export type Order = 'asc' | 'desc'
+
+export const getSorting = (order: Order, orderBy: string) =>
+  (order === 'desc' ? (a: any, b: any) => desc(a, b, orderBy) : (a: any, b: any) => -desc(a, b, orderBy))