# prefer-array-slice

📝 Prefer `Array#slice()` over `Array#splice()` when reading from the returned array.

💼🚫 This rule is enabled in the ✅ `recommended` [config](https://github.com/sindresorhus/eslint-plugin-unicorn#recommended-config). This rule is _disabled_ in the ☑️ `unopinionated` [config](https://github.com/sindresorhus/eslint-plugin-unicorn#recommended-config).

💡 This rule is manually fixable by [editor suggestions](https://eslint.org/docs/latest/use/core-concepts#rule-suggestions).

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Prefer `Array#slice()` over `Array#splice()` when reading from the returned array.

`Array#splice()` mutates the source array. When the returned elements are immediately indexed or read with `.at()`, `Array#slice()` expresses the read-only intent without changing the source array.

## Examples

```js
// ❌
const foo = process.argv.splice(2)[0];

// ✅
const foo = process.argv.slice(2)[0];
```

```js
// ❌
const foo = array.splice(index).at(0);

// ✅
const foo = array.slice(index).at(0);
```

```js
// ✅
array.splice(index);
```

```js
// ✅
array.splice(index, deleteCount)[0];
```

Keep `Array#splice()` when intentional mutation is part of the operation.