oxc/bad-char-at-comparison Correctness

✅ This rule is turned on by default.

What it does

This rule warns when the return value of the charAt method is used to compare a string of length greater than 1.

Why is this bad?

The charAt method returns a string of length 1. If the return value is compared with a string of length greater than 1, the comparison will always be false.

Examples

Examples of incorrect code for this rule:

a.charAt(4) === 'a2';
a.charAt(4) === '/n';

Examples of correct code for this rule:

a.charAt(4) === 'a'
a.charAt(4) === '\n';

How to use

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

Config (.oxlintrc.json)

{
    "rules": {
        "oxc/bad-char-at-comparison": "error"
    }
}

CLI

oxlint --deny oxc/bad-char-at-comparison

References

• Rule Source