unicorn/prefer-at Pedantic

⚠️🛠️️ A dangerous auto-fix is available for this rule.

What it does

Prefer .at() method for index access and String#charAt().

Why is this bad?

The .at() method is more readable and consistent for accessing elements by index, especially for negative indices which access elements from the end.

Examples

Examples of incorrect code for this rule:

const foo = array[array.length - 1];
const foo = array.slice(-1)[0];
const foo = string.charAt(string.length - 1);

Examples of correct code for this rule:

const foo = array.at(-1);
const foo = array.at(-5);
const foo = string.at(-1);

How to use

To enable this rule in the CLI or using the config file, you can use:

CLI

oxlint --deny unicorn/prefer-at

Config (.oxlintrc.json)

{
  "rules": {
    "unicorn/prefer-at": "error"
  }
}

References

• Rule Source