deno.land / std@0.166.0 / collections / drop_while_test.ts

drop_while_test.ts
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";import { dropWhile } from "./drop_while.ts";
Deno.test("[collections/dropWhile] Array", () => { const arr = [1, 2, 3, 4, 5, 6]; const actual = dropWhile(arr, (i) => i !== 2);
assertEquals(actual, [2, 3, 4, 5, 6]);});
Deno.test("[collections/dropWhile] Add two to each num in predicate", () => { const arr = [1, 2, 3, 4, 5, 6]; const actual = dropWhile(arr, (i) => i + 2 !== 6);
assertEquals(actual, [4, 5, 6]);});
Deno.test("[collections/dropWhile] Negatives", () => { const arr = [-5, -6];
const actual = dropWhile(arr, (i) => i < -4); assertEquals(actual, []);});
Deno.test("[collections/dropWhile] No mutation", () => { const arr = [1, 2, 3, 4, 5, 6];
const actual = dropWhile(arr, (i) => i !== 4); assertEquals(actual, [4, 5, 6]); assertEquals(arr, [1, 2, 3, 4, 5, 6]);});
Deno.test("[collections/dropWhile] Empty input array returns empty array", () => { const arr: number[] = [];
const actual = dropWhile(arr, (i) => i > 4);
assertEquals(actual, []);});
Deno.test("[collections/dropWhile] Returns empty array when the last element doesn't match the predicate", () => { const arr = [1, 2, 3, 4];
const actual = dropWhile(arr, (i) => i !== 4);
assertEquals(actual, [4]);});
Deno.test("[collections/dropWhile] Returns the same array when all elements match the predicate", () => { const arr = [1, 2, 3, 4];
const actual = dropWhile(arr, (i) => i !== 400);
assertEquals(actual, []);});
std
Deno standard library
GitHub Repositorydenoland/deno_std
GitHub Stars
2458

Version Info

Tagged at
2 months ago