Icu 10307 create a new helper (#1791)

* chore: 🤖 truncate helper for longer list

addons/core/addon/helpers/truncate-list.js

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) HashiCorp, Inc.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
+/**
+ * Use this helper to truncate the list if there are more items than the limit specified
+ *
+ * @example
+ *
+ * {{truncate-list array limit}}
+ */
+
+import Helper from '@ember/component/helper';
+import { inject as service } from '@ember/service';
+
+export default class extends Helper {
+  // =services
+  @service intl;
+
+  // =compute method
+
+  /**
+   * This helper truncates the list if there are more items than the limit specified
+   * and returns the original list appended with +N remaining items
+   * @param {array} list List of items
+   * @return string
+   */
+
+  compute([translation, list, limit = 3]) {
+    if (list) {
+      const numberOfItems = Object.keys(list).length;
+      const items = list.map(({ value }) => value);
+      if (numberOfItems > limit) {
+        const remainingItems = items.splice(limit).length;
+        return items.join(', ') + this.intl.t(translation, { remainingItems });
+      } else {
+        return items.join(', ');
+      }
+    }
+  }
+}