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revert(collection): Remove findLastIndex from std/collections (#1528)

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Yasser A.Idrissi 2021-12-13 16:51:32 +01:00 committed by GitHub
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commit 68f093fb71
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15
collections/README.md
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@ -279,21 +279,6 @@ assertEquals(
);
```
### findLastIndex
Returns the index of the last element in the given array matching the given
predicate.
```ts
import { findLastIndex } from "https://deno.land/std@$STD_VERSION/collections/mod.ts";
import { assertEquals } from "https://deno.land/std@$STD_VERSION/testing/asserts.ts";
const numbers = [0, 1, 2, 3, 4, 5, 6];
const lastIndexEvenNumber = findLastIndex(numbers, (it) => it % 2 === 0);
assertEquals(lastIndexEvenNumber, 6);
```
### findSingle
Returns an element if and only if that element is the only one matching the

34
collections/find_last_index.ts
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@ -1,34 +0,0 @@
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
/**
* @deprecated Use `Array.prototype.findLastIndex`. This function will be removed in std@0.117.0.
*
* Returns the index of the last element in the given array matching the given predicate
*
* Example:
*
* ```ts
* import { findLastIndex } from "https://deno.land/std@$STD_VERSION/collections/mod.ts";
* import { assertEquals } from "https://deno.land/std@$STD_VERSION/testing/asserts.ts";
*
* const numbers = [ 4, 2, 7 ]
* const lastIndexNumber = findLastIndex(numbers, it => it % 2 === 0)
*
* assertEquals(lastIndexNumber, 1)
* ```
*/
export function findLastIndex<T>(
array: readonly T[],
predicate: (el: T) => boolean,
): number | undefined {
for (let i = array.length - 1; i >= 0; i -= 1) {
const element = array[i];
if (predicate(element)) {
return i;
}
}
return undefined;
}

47
collections/find_last_index_test.ts
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@ -1,47 +0,0 @@
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";
import { findLastIndex } from "./find_last_index.ts";
function findLastIndexTest<I>(
input: [Array<I>, (element: I) => boolean],
expected: number | undefined,
message?: string,
) {
const actual = findLastIndex(...input);
assertEquals(actual, expected, message);
}
Deno.test({
name: "[collections/findLastIndex] empty input",
fn() {
findLastIndexTest([[], (_) => true], undefined);
},
});
Deno.test({
name: "[collections/findLastIndex] no matches",
fn() {
findLastIndexTest([[9, 11, 13], (it) => it % 2 === 0], undefined);
findLastIndexTest([["foo", "bar"], (it) => it.startsWith("z")], undefined);
},
});
Deno.test({
name: "[collections/findLastIndex] only match",
fn() {
findLastIndexTest([[9, 12, 13], (it) => it % 2 === 0], 1);
findLastIndexTest([["zap", "foo", "bar"], (it) => it.startsWith("z")], 0);
},
});
Deno.test({
name: "[collections/findLastIndex] multiple matches",
fn() {
findLastIndexTest([[0, 1, 2, 3, 4, 5, 6], (it) => it % 2 === 0], 6);
findLastIndexTest(
[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9], (it) => it % 2 === 0],
8,
);
},
});

1
collections/mod.ts
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@ -11,7 +11,6 @@ export * from "./drop_while.ts";
export * from "./filter_entries.ts";
export * from "./filter_keys.ts";
export * from "./filter_values.ts";
export * from "./find_last_index.ts";
export * from "./group_by.ts";
export * from "./intersect.ts";
export * from "./map_entries.ts";