Merge pull request #5 from jsr-core/fix-take-drop-on-async

feat: add `TakeLimitError` and `DropLimitError` on async

Author: lambdalisue

async/drop.ts

@@ -20,10 +20,8 @@ export function drop<T>(
   iterable: Iterable<T> | AsyncIterable<T>,
   limit: number,
 ): AsyncIterable<T> {
-  if (limit < 0) {
-    throw new Error(
-      `limit argument must be greater than or equal to 0, but got ${limit}.`,
-    );
+  if (limit < 0 || !Number.isSafeInteger(limit)) {
+    throw new DropLimitError(limit);
   }
   return async function* () {
     let i = 0;
@@ -34,3 +32,12 @@ export function drop<T>(
     }
   }();
 }
+
+/**
+ * Error thrown when the 'limit' is negative or not a safe integer.
+ */
+export class DropLimitError extends Error {
+  constructor(limit: number) {
+    super(`The 'limit' must be 0 or positive safe integer, but got ${limit}.`);
+  }
+}

async/drop_test.ts

@@ -2,7 +2,7 @@ import { assertEquals, assertThrows } from "@std/assert";
 import { assertType, type IsExact } from "@std/testing/types";
 import { toAsyncIterable } from "./to_async_iterable.ts";
 import { toArray } from "./to_array.ts";
-import { drop } from "./drop.ts";
+import { drop, DropLimitError } from "./drop.ts";
 
 Deno.test("drop", async (t) => {
   await t.step("with async iterable", async (t) => {
@@ -18,8 +18,7 @@ Deno.test("drop", async (t) => {
         () => {
           drop([0, 1, 2, 3, 4], -2);
         },
-        Error,
-        "limit argument must be greater than or equal to 0, but got -2.",
+        DropLimitError,
       );
     });
 
@@ -44,8 +43,7 @@ Deno.test("drop", async (t) => {
         () => {
           drop([0, 1, 2, 3, 4], -2);
         },
-        Error,
-        "limit argument must be greater than or equal to 0, but got -2.",
+        DropLimitError,
       );
     });
 

async/take.ts

@@ -20,10 +20,8 @@ export function take<T>(
   iterable: Iterable<T> | AsyncIterable<T>,
   limit: number,
 ): AsyncIterable<T> {
-  if (limit < 0) {
-    throw new Error(
-      `limit argument must be greater than or equal to 0, but got ${limit}.`,
-    );
+  if (limit < 0 || !Number.isSafeInteger(limit)) {
+    throw new TakeLimitError(limit);
   }
   return async function* () {
     let i = 0;
@@ -35,3 +33,12 @@ export function take<T>(
     }
   }();
 }
+
+/**
+ * Error thrown when the 'limit' is negative or not a safe integer.
+ */
+export class TakeLimitError extends Error {
+  constructor(limit: number) {
+    super(`The 'limit' must be 0 or positive safe integer, but got ${limit}.`);
+  }
+}

async/take_test.ts

@@ -2,7 +2,7 @@ import { assertEquals, assertThrows } from "@std/assert";
 import { assertType, type IsExact } from "@std/testing/types";
 import { toAsyncIterable } from "./to_async_iterable.ts";
 import { toArray } from "./to_array.ts";
-import { take } from "./take.ts";
+import { take, TakeLimitError } from "./take.ts";
 
 Deno.test("take", async (t) => {
   await t.step("with async iterable", async (t) => {
@@ -18,8 +18,7 @@ Deno.test("take", async (t) => {
         () => {
           take([0, 1, 2, 3, 4], -2);
         },
-        Error,
-        "limit argument must be greater than or equal to 0, but got -2.",
+        TakeLimitError,
       );
     });
 
@@ -44,8 +43,7 @@ Deno.test("take", async (t) => {
         () => {
           take([0, 1, 2, 3, 4], -2);
         },
-        Error,
-        "limit argument must be greater than or equal to 0, but got -2.",
+        TakeLimitError,
       );
     });