Add erase function (#2641)

2 files changed, 7 insertions, 6 deletions

diff --git a/src/server/api/endpoints/hashtags/trend.ts b/src/server/api/endpoints/hashtags/trend.ts
index 01dfccc71c..e7c08ca9f0 100644
--- a/src/server/api/endpoints/hashtags/trend.ts
+++ b/src/server/api/endpoints/hashtags/trend.ts
@@ -1,4 +1,5 @@
 import Note from '../../../../models/note';
+import { erase } from '../../../../prelude/array';
 
 /*
 トレンドに載るためには「『直近a分間のユニーク投稿数が今からa分前～今からb分前の間のユニーク投稿数のn倍以上』のハッシュタグの上位5位以内に入る」ことが必要
@@ -85,8 +86,7 @@ export default () => new Promise(async (res, rej) => {
 	//#endregion
 
 	// タグを人気順に並べ替え
-	let hots = (await Promise.all(hotsPromises))
-		.filter(x => x != null)
+	let hots = erase(null, await Promise.all(hotsPromises))
 		.sort((a, b) => b.count - a.count)
 		.map(tag => tag.name)
 		.slice(0, max);
diff --git a/src/server/api/endpoints/notes/search_by_tag.ts b/src/server/api/endpoints/notes/search_by_tag.ts
index 82f11a9775..77082c2600 100644
--- a/src/server/api/endpoints/notes/search_by_tag.ts
+++ b/src/server/api/endpoints/notes/search_by_tag.ts
@@ -5,6 +5,7 @@ import Mute from '../../../../models/mute';
 import { getFriendIds } from '../../common/get-friends';
 import { pack } from '../../../../models/note';
 import getParams from '../../get-params';
+import { erase } from '../../../../prelude/array';
 
 export const meta = {
 	desc: {
@@ -103,23 +104,23 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 	if (psErr) throw psErr;
 
 	if (ps.includeUserUsernames != null) {
-		const ids = (await Promise.all(ps.includeUserUsernames.map(async (username) => {
+		const ids = erase(null, await Promise.all(ps.includeUserUsernames.map(async (username) => {
 			const _user = await User.findOne({
 				usernameLower: username.toLowerCase()
 			});
 			return _user ? _user._id : null;
-		}))).filter(id => id != null);
+		})));
 
 		ids.forEach(id => ps.includeUserIds.push(id));
 	}
 
 	if (ps.excludeUserUsernames != null) {
-		const ids = (await Promise.all(ps.excludeUserUsernames.map(async (username) => {
+		const ids = erase(null, await Promise.all(ps.excludeUserUsernames.map(async (username) => {
 			const _user = await User.findOne({
 				usernameLower: username.toLowerCase()
 			});
 			return _user ? _user._id : null;
-		}))).filter(id => id != null);
+		})));
 
 		ids.forEach(id => ps.excludeUserIds.push(id));
 	}