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

sort_by_test.ts
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";import { sortBy } from "./sort_by.ts";
Deno.test({ name: "[collections/sortBy] no mutation", fn() { const array = ["a", "abc", "ba"]; sortBy(array, (it) => it.length);
assertEquals(array, ["a", "abc", "ba"]); },});
Deno.test({ name: "[collections/sortBy] calls the selector function once", fn() { let callCount = 0; const array = [0, 1, 2]; sortBy(array, (it) => { callCount++; return it; });
assertEquals(callCount, array.length); },});
Deno.test({ name: "[collections/sortBy] empty input", fn() { assertEquals(sortBy([], () => 5), []); },});
Deno.test({ name: "[collections/sortBy] identity selector", fn() { assertEquals(sortBy([2, 3, 1], (it) => it), [1, 2, 3]); },});
Deno.test({ name: "[collections/sortBy] stable sort", fn() { assertEquals( sortBy([ { id: 1, date: "February 1, 2022" }, { id: 2, date: "December 17, 1995" }, { id: 3, date: "June 12, 2012" }, { id: 4, date: "December 17, 1995" }, { id: 5, date: "June 12, 2012" }, ], (it) => new Date(it.date)), [ { id: 2, date: "December 17, 1995" }, { id: 4, date: "December 17, 1995" }, { id: 3, date: "June 12, 2012" }, { id: 5, date: "June 12, 2012" }, { id: 1, date: "February 1, 2022" }, ], );
assertEquals( sortBy([ { id: 1, str: "c" }, { id: 2, str: "a" }, { id: 3, str: "b" }, { id: 4, str: "a" }, { id: 5, str: "b" }, ], (it) => it.str), [ { id: 2, str: "a" }, { id: 4, str: "a" }, { id: 3, str: "b" }, { id: 5, str: "b" }, { id: 1, str: "c" }, ], ); },});
Deno.test({ name: "[collections/sortBy] special number values", fn() { assertEquals( sortBy([ 1, Number.POSITIVE_INFINITY, 2, Number.NEGATIVE_INFINITY, 3, Number.NaN, 4, Number.NaN, ], (it) => it), [ Number.NEGATIVE_INFINITY, 1, 2, 3, 4, Number.POSITIVE_INFINITY, Number.NaN, Number.NaN, ], );
assertEquals( sortBy([ Number.NaN, 1, Number.POSITIVE_INFINITY, Number.NaN, 7, Number.NEGATIVE_INFINITY, Number.NaN, 2, 6, 5, 9, ], (it) => it), [ Number.NEGATIVE_INFINITY, 1, 2, 5, 6, 7, 9, Number.POSITIVE_INFINITY, Number.NaN, Number.NaN, Number.NaN, ], );
// Test that NaN sort is stable. const nanArray = [ { id: 1, nan: Number.NaN }, { id: 2, nan: Number.NaN }, { id: 3, nan: Number.NaN }, { id: 4, nan: Number.NaN }, ]; assertEquals(sortBy(nanArray, ({ nan }) => nan), nanArray); },});
Deno.test({ name: "[collections/sortBy] sortings", fn() { const testArray = [ { name: "benchmark", stage: 3 }, { name: "test", stage: 2 }, { name: "build", stage: 1 }, { name: "deploy", stage: 4 }, ];
assertEquals(sortBy(testArray, (it) => it.stage), [ { name: "build", stage: 1 }, { name: "test", stage: 2 }, { name: "benchmark", stage: 3 }, { name: "deploy", stage: 4 }, ]);
assertEquals(sortBy(testArray, (it) => it.name), [ { name: "benchmark", stage: 3 }, { name: "build", stage: 1 }, { name: "deploy", stage: 4 }, { name: "test", stage: 2 }, ]);
assertEquals( sortBy([ "9007199254740999", "9007199254740991", "9007199254740995", ], (it) => BigInt(it)), [ "9007199254740991", "9007199254740995", "9007199254740999", ], );
assertEquals( sortBy([ "February 1, 2022", "December 17, 1995", "June 12, 2012", ], (it) => new Date(it)), [ "December 17, 1995", "June 12, 2012", "February 1, 2022", ], ); },});
std
Deno standard library
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Tagged at
2 months ago