feat: add function to get authorization results for canViewerUpdateAs…

…ync/canViewerDeleteAsync (#249)
expo · Nov 20, 2024 · 27a358d · 27a358d
1 parent c2ae21b
commit 27a358d
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Showing 4 changed files with 333 additions and 108 deletions.
diff --git a/packages/entity/src/__tests__/entityUtils-test.ts b/packages/entity/src/__tests__/entityUtils-test.ts
@@ -7,6 +7,7 @@ import {
   successfulResultsFilterMap,
   failedResultsFilterMap,
   pick,
+  partitionArray,
 } from '../entityUtils';
 
 describe(enforceResultsAsync, () => {
@@ -97,3 +98,14 @@ describe(pick, () => {
     });
   });
 });
+
+describe(partitionArray, () => {
+  it('partitions array', () => {
+    type A = true;
+    type B = false;
+    const arr: (A | B)[] = [true, false, true, true, false];
+    const [as, bs] = partitionArray<A, B>(arr, (val: A | B): val is A => val === true);
+    expect(as).toMatchObject([true, true, true]);
+    expect(bs).toMatchObject([false, false]);
+  });
+});
diff --git a/packages/entity/src/entityUtils.ts b/packages/entity/src/entityUtils.ts
@@ -71,22 +71,37 @@ export const failedResultsFilterMap = <K, T>(
   return ret;
 };
 
+export type PartitionArrayPredicate<T, U> = (val: T | U) => val is T;
+
 /**
- * Partition array of values and errors into an array of values and an array of errors.
- * @param valuesAndErrors - array of values and errors
+ * Partition an array of values into two arrays based on evaluation of a binary predicate.
+ * @param values - array of values to partition
+ * @param predicate - binary predicate to evaluate partition group of each value
  */
-export const partitionErrors = <T>(valuesAndErrors: (T | Error)[]): [T[], Error[]] => {
-  const values: T[] = [];
-  const errors: Error[] = [];
+export const partitionArray = <T, U>(
+  values: (T | U)[],
+  predicate: PartitionArrayPredicate<T, U>,
+): [T[], U[]] => {
+  const ts: T[] = [];
+  const us: U[] = [];
 
-  for (const valueOrError of valuesAndErrors) {
-    if (isError(valueOrError)) {
-      errors.push(valueOrError);
+  for (const value of values) {
+    if (predicate(value)) {
+      ts.push(value);
     } else {
-      values.push(valueOrError);
+      us.push(value);
     }
   }
 
+  return [ts, us];
+};
+
+/**
+ * Partition array of values and errors into an array of values and an array of errors.
+ * @param valuesAndErrors - array of values and errors
+ */
+export const partitionErrors = <T>(valuesAndErrors: (T | Error)[]): [T[], Error[]] => {
+  const [errors, values] = partitionArray<Error, T>(valuesAndErrors, isError);
   return [values, errors];
 };