---
url: /docs/guide/usage/linter/rules/unicorn/prefer-string-trim-start-end.md
---

### What it does

[`String#trimLeft()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trimLeft) and [`String#trimRight()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trimRight) are aliases of [`String#trimStart()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trimStart) and [`String#trimEnd()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trimEnd). This is to ensure consistency and use [direction](https://developer.mozilla.org/en-US/docs/Learn/CSS/Building_blocks/Handling_different_text_directions)-independent wording.

### Why is this bad?

The `trimLeft` and `trimRight` names are confusing and inconsistent with the rest of the language.

### Examples

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

```javascript
str.trimLeft();
str.trimRight();
```

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

```javascript
str.trimStart();
str.trimEnd();
```

## How to use

## Version

This rule was added in v0.0.16.

## References