mirror of
https://github.com/denoland/deno.git
synced 2024-12-29 10:39:10 -05:00
25 lines
817 B
TypeScript
25 lines
817 B
TypeScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
|
|
import { assert, assertEquals } from "./test_util.ts";
|
|
|
|
// TODO(@kitsonk) remove when we are no longer patching TypeScript to have
|
|
// these types available.
|
|
|
|
Deno.test(function typeCheckingEsNextArrayString() {
|
|
const a = "abcdef";
|
|
assertEquals(a.at(-1), "f");
|
|
const b = ["a", "b", "c", "d", "e", "f"];
|
|
assertEquals(b.at(-1), "f");
|
|
assertEquals(b.findLast((val) => typeof val === "string"), "f");
|
|
assertEquals(b.findLastIndex((val) => typeof val === "string"), 5);
|
|
});
|
|
|
|
Deno.test(function objectHasOwn() {
|
|
const a = { a: 1 };
|
|
assert(Object.hasOwn(a, "a"));
|
|
assert(!Object.hasOwn(a, "b"));
|
|
});
|
|
|
|
Deno.test(function errorCause() {
|
|
const e = new Error("test", { cause: "something" });
|
|
assertEquals(e.cause, "something");
|
|
});
|