From a07037affc38d9f753682dacc4d941838648c74d Mon Sep 17 00:00:00 2001
From: MeiMei <30769358+mei23@users.noreply.github.com>
Date: Wed, 9 Mar 2022 22:18:14 +0900
Subject: テーマ選択から重複要素を排除するように (#8385)
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---
 packages/client/src/scripts/array.ts | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'packages/client/src/scripts/array.ts')

diff --git a/packages/client/src/scripts/array.ts b/packages/client/src/scripts/array.ts
index d63f0475d0..29d027de14 100644
--- a/packages/client/src/scripts/array.ts
+++ b/packages/client/src/scripts/array.ts
@@ -52,6 +52,17 @@ export function unique<T>(xs: T[]): T[] {
 	return [...new Set(xs)];
 }
 
+export function uniqueBy<TValue, TKey>(values: TValue[], keySelector: (value: TValue) => TKey): TValue[] {
+	const map = new Map<TKey, TValue>();
+
+	for (const value of values) {
+		const key = keySelector(value);
+		if (!map.has(key)) map.set(key, value);
+	}
+
+	return [...map.values()];
+}
+
 export function sum(xs: number[]): number {
 	return xs.reduce((a, b) => a + b, 0);
 }
-- 
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