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map_not_nullish_test.ts
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map_not_nullish_test.ts
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";
import { mapNotNullish } from "./map_not_nullish.ts";
function mapNotNullishTest<T, O>(
input: [Array<T>, (el: T) => O | undefined | null],
expected: Array<O>,
message?: string,
) {
const actual = mapNotNullish(...input);
assertEquals(actual, expected, message);
}
Deno.test({
name: "[collections/mapNotNullish] no mutation",
fn() {
const array = [1, 2, 3, 4];
mapNotNullish(array, (it) => it * 2);
assertEquals(array, [1, 2, 3, 4]);
},
});
Deno.test({
name: "[collections/mapNotNullish] empty input",
fn() {
mapNotNullishTest(
[[], (it) => it],
[],
);
},
});
Deno.test({
name: "[collections/mapNotNullish] identity",
fn() {
mapNotNullishTest(
[
[[], 1, 3],
(it) => it,
],
[[], 1, 3],
);
},
});
Deno.test({
name: "[collections/mapNotNullish] mappers without nullish values",
fn() {
mapNotNullishTest(
[
["Anna", "Kim", "Hans"],
(it) => it.charAt(0),
],
["A", "K", "H"],
);
mapNotNullishTest(
[
[3, 4, 5, 6],
(it) => it * 2,
],
[6, 8, 10, 12],
);
},
});
Deno.test({
name: "[collections/mapNotNullish] mappers with nullish values",
fn() {
mapNotNullishTest(
[
["Errors: 5", "Success", "Warnings: 10", "..."],
(it) =>
it.match(/\w+: (?<numberOfProblems>\d+)/u)?.groups?.numberOfProblems,
],
["5", "10"],
);
mapNotNullishTest(
[
[
{ first: "Kim", middle: undefined, last: "Example" },
{ first: "Arthur", middle: "Hans", last: "Somename" },
{ first: "Laura", middle: "Marija", last: "Anothername" },
{ first: "Sam", middle: null, last: "Smith" },
],
(it) => it.middle,
],
["Hans", "Marija"],
);
},
});