misc : introduce List.firstIfSingle extension

2024-12-09 11:18:04 +01:00
parent 98c0697a3f
commit 421bbba558
2 changed files with 18 additions and 11 deletions
--- a/libraries/core/src/main/kotlin/io/element/android/libraries/core/extensions/List.kt
+++ b/libraries/core/src/main/kotlin/io/element/android/libraries/core/extensions/List.kt
@@ -0,0 +1,15 @@
+/*
+ * Copyright 2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Please see LICENSE in the repository root for full details.
+ */
+
+package io.element.android.libraries.core.extensions
+
+/**
+ * Returns the first element if the list contains exactly one element, otherwise returns null.
+ */
+inline fun <reified T> List<T>.firstIfSingle(): T? {
+    return if (size == 1) first() else null
+}