feat: Created arrayHas and stringArrayHas util functions.

Signed-off-by: Marley Powell <Marley.Powell@exclaimer.com>

plugins/azure-devops/src/utils/arrayHas.ts

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2021 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export function arrayHas<T>(arr: T[], value: T): boolean {
+  return new Set<T>(arr).has(value);
+}
+
+export function stringArrayHas(
+  arr: Array<string | undefined>,
+  value: string | undefined,
+  ignoreCase: boolean = false,
+): boolean {
+  if (ignoreCase) {
+    return arrayHas(
+      arr.map(a => a?.toLocaleLowerCase('en-US')),
+      value?.toLocaleLowerCase('en-US'),
+    );
+  }
+
+  return arrayHas(arr, value);
+}