> For AI agents: the complete documentation index is available at https://rslint.rs/llms.txt, the full documentation bundle is available at https://rslint.rs/llms-full.txt.

# prefer-array-last-methods

[Added in v0.9.4](https://github.com/web-infra-dev/rslint/releases/tag/v0.9.4)
## Configuration

| Preset                              | Configured Value |
| ----------------------------------- | ---------------- |
| ✅ unicornPlugin.configs.recommended | `"error"`        |


```ts title=rslint.config.ts
import { defineConfig, unicornPlugin } from '@rslint/core';

export default defineConfig([
  unicornPlugin.configs.recommended,
  {
    rules: {
      'unicorn/prefer-array-last-methods': 'error',
    },
  },
]);
```

Prefer last-oriented array methods over reversing an array and then calling the corresponding forward method.

The rule recognizes:

- `.reverse().find()` and `.toReversed().find()` → `.findLast()`
- `.reverse().findIndex()` and `.toReversed().findIndex()` → `.findLastIndex()`
- `.reverse().indexOf()` and `.toReversed().indexOf()` → `.lastIndexOf()`
- `.reverse().reduce()` and `.toReversed().reduce()` → `.reduceRight()`

```js
// Incorrect
const result = array.reverse().find(isUnicorn);

// Correct
const result = array.findLast(isUnicorn);
```

The rule reports a diagnostic and offers an editor suggestion rather than an automatic fix because replacing reversal can change observable mutation, sparse-array, callback-index, or index-return semantics. Suggestions are withheld when comments occur inside the matched call.

This port follows eslint-plugin-unicorn v75.0.0.

- [Upstream documentation](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/v75.0.0/docs/rules/prefer-array-last-methods.md)
- [Upstream source](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/v75.0.0/rules/prefer-array-last-methods.js)