---
url: /docs/guide/usage/linter/rules/unicorn/prefer-string-starts-ends-with.md
---

### What it does

Prefer [`String#startsWith()`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith) and [`String#endsWith()`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith) over using a regex with `/^foo/` or `/foo$/`.

::: warning
This rule is deprecated. Prefer the type-aware [`typescript/prefer-string-starts-ends-with`](https://oxc.rs/docs/guide/usage/linter/rules/typescript/prefer-string-starts-ends-with.html) rule instead.
:::

### Why is this bad?

Using `String#startsWith()` and `String#endsWith()` is more readable and performant as it does not need to parse a regex.

### Examples

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

```javascript
const foo = "hello";
/^abc/.test(foo);
```

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

```javascript
const foo = "hello";
foo.startsWith("abc");
```

## How to use

## Version

This rule was added in v0.0.18.

## References