unicorn/no-useless-length-check Correctness

✅ This rule is turned on by default.

🚧 An auto-fix is still under development.

It checks for an unnecessary array length check in a logical expression.

The cases are:

array.length === 0 || array.every(Boolean) (array.every returns true if array is has elements)
array.length > 0 && array.some(Boolean) (array.some returns false if array is empty)

An extra unnecessary length check is done.

Examples of incorrect code for this rule:

javascript

if (array.length === 0 || array.every(Boolean)) {
  // do something!
}

Examples of correct code for this rule:

javascript

if (array.every(Boolean)) {
  // do something!
}

How to use

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

CLIConfig (.oxlintrc.json)

bash

oxlint --deny unicorn/no-useless-length-check

json

{
  "rules": {
    "unicorn/no-useless-length-check": "error"
  }
}