oxc/bad-array-method-on-arguments Correctness

✅ This rule is turned on by default.

What it does

This rule applies when an array method is called on the arguments object itself.

Why is this bad?

The arguments object is not an array, but an array-like object. It should be converted to a real array before calling an array method. Otherwise, a TypeError exception will be thrown because of the non-existent method.

Examples

Examples of incorrect code for this rule:

function add(x, y) {
  return x + y;
}
function sum() {
  return arguments.reduce(add, 0);
}

Examples of correct code for this rule:

function add(x, y) {
  return x + y;
}
function sum(...args) {
  return args.reduce(add, 0);
}

How to use

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

CLI

oxlint --deny oxc/bad-array-method-on-arguments

Config (.oxlintrc.json)

{
  "rules": {
    "oxc/bad-array-method-on-arguments": "error"
  }
}

References

• Rule Source