---
url: /docs/guide/usage/linter/rules/unicorn/no-array-method-this-argument.md
---

### What it does

Disallows the use of the `thisArg` parameter in array iteration methods such as
`map`, `filter`, `some`, `every`, and similar.

### Why is this bad?

The `thisArg` parameter makes code harder to understand and reason about. Instead,
prefer arrow functions or bind explicitly in a clearer way. Arrow functions inherit
`this` from the lexical scope, which is more intuitive and less error-prone.

### Examples

Examples of **incorrect** code for this rule:

```js
array.map(function (x) {
  return x + this.y;
}, this);
array.filter(function (x) {
  return x !== this.value;
}, this);
```

Examples of **correct** code for this rule:

```js
array.map((x) => x + this.y);
array.filter((x) => x !== this.value);
const self = this;
array.map(function (x) {
  return x + self.y;
});
```

## How to use

## Version

This rule was added in v0.16.12.

## References