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denoland-deno/tests/unit/esnext_test.ts

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1.7 KiB
TypeScript

// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { 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 b = ["a", "b", "c", "d", "e", "f"];
assertEquals(b.findLast((val) => typeof val === "string"), "f");
assertEquals(b.findLastIndex((val) => typeof val === "string"), 5);
});
Deno.test(function intlListFormat() {
const formatter = new Intl.ListFormat("en", {
style: "long",
type: "conjunction",
});
assertEquals(
formatter.format(["red", "green", "blue"]),
"red, green, and blue",
);
const formatter2 = new Intl.ListFormat("en", {
style: "short",
type: "disjunction",
});
assertEquals(formatter2.formatToParts(["Rust", "golang"]), [
{ type: "element", value: "Rust" },
{ type: "literal", value: " or " },
{ type: "element", value: "golang" },
]);
// Works with iterables as well
assertEquals(
formatter.format(new Set(["red", "green", "blue"])),
"red, green, and blue",
);
assertEquals(formatter2.formatToParts(new Set(["Rust", "golang"])), [
{ type: "element", value: "Rust" },
{ type: "literal", value: " or " },
{ type: "element", value: "golang" },
]);
});
Deno.test(function setUnion() {
const a = new Set([1, 2, 3]);
const b = new Set([3, 4, 5]);
const union = a.union(b);
assertEquals(union, new Set([1, 2, 3, 4, 5]));
});
Deno.test(function float16Array() {
const myNums = Float16Array.from([11.25, 2, -22.5, 1]);
const sorted = myNums.toSorted((a, b) => a - b);
assertEquals(sorted[0], -22.5);
assertEquals(sorted[1], 1);
assertEquals(sorted[2], 2);
assertEquals(sorted[3], 11.25);
});