Iterate lexicographic ordering implementation

src/utils/arrays.ts

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {percentageOf, percentageWithin} from "./numbers";
+import { percentageOf, percentageWithin } from "./numbers";
 
 /**
  * Quickly resample an array to have less/more data points. If an input which is larger
@@ -223,6 +223,21 @@ export function arrayMerge<T>(...a: T[][]): T[] {
     }, new Set<T>()));
 }
 
+/**
+ * Moves a single element from fromIndex to toIndex.
+ * @param list the list from which to construct the new list.
+ * @param fromIndex the index of the element to move.
+ * @param toIndex the index of where to put the element.
+ * @returns A new array with the requested value moved.
+ */
+export function reorder<T>(list: T[], fromIndex: number, toIndex: number): T[] {
+    const result = Array.from(list);
+    const [removed] = result.splice(fromIndex, 1);
+    result.splice(toIndex, 0, removed);
+
+    return result;
+}
+
 /**
  * Helper functions to perform LINQ-like queries on arrays.
  */