From 4c6c06c80afd3e2309b305f40c2e67e48863bf31 Mon Sep 17 00:00:00 2001
From: MeiMei <30769358+mei23@users.noreply.github.com>
Date: Mon, 21 Oct 2019 00:43:39 +0900
Subject: Improve emoji-picker (#5515)
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* Improve emoji-picker

* remove unimplanted translation

* カテゴリのサジェスト

* use unique
---
 src/prelude/array.ts | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/prelude/array.ts')

diff --git a/src/prelude/array.ts b/src/prelude/array.ts
index 839bbc920b..f4d684d574 100644
--- a/src/prelude/array.ts
+++ b/src/prelude/array.ts
@@ -84,6 +84,19 @@ export function groupOn<T, S>(f: (x: T) => S, xs: T[]): T[][] {
 	return groupBy((a, b) => f(a) === f(b), xs);
 }
 
+export function groupByX<T>(collections: T[], keySelector: (x: T) => string) {
+	return collections.reduce((obj: Record<string, T[]>, item: T) => {
+		const key = keySelector(item);
+		if (!obj.hasOwnProperty(key)) {
+			obj[key] = [];
+		}
+
+		obj[key].push(item);
+
+		return obj;
+	}, {});
+}
+
 /**
  * Compare two arrays by lexicographical order
  */
-- 
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