Creates some array helpers

SparkPost · May 24, 2018 · e3b63a0 · e3b63a0
1 parent 6ae875a
commit e3b63a0
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/packages/matchbox/src/helpers/array.js b/packages/matchbox/src/helpers/array.js
@@ -0,0 +1,6 @@
+export const groupBy = (list, groupingKey) => list.reduce((acc, item) => {
+  const index = item[groupingKey];
+  return { ...acc, [index]: [ ...(acc[index] || []), item ] };
+}
+
+export const groupByValues = (list, groupingKey) => Object.values(groupBy(list, groupingKey))