diff --git a/docs/src/rules/guard-for-in.md b/docs/src/rules/guard-for-in.md index f358e503039..0cdecb43a53 100644 --- a/docs/src/rules/guard-for-in.md +++ b/docs/src/rules/guard-for-in.md @@ -2,6 +2,7 @@ title: guard-for-in rule_type: suggestion related_rules: +- prefer-object-has-own - no-prototype-builtins further_reading: - https://javascriptweblog.wordpress.com/2011/01/04/exploring-javascript-for-in-loops/ @@ -17,6 +18,10 @@ for (key in foo) { } ``` +For codebases that do not support ES2022, `Object.prototype.hasOwnProperty.call(foo, key)` can be used as a check that the property is not inherited. + +For codebases that do support ES2022, `Object.hasOwn(foo, key)` can be used as a shorter alternative; see [prefer-object-has-own](prefer-object-has-own). + Note that simply checking `foo.hasOwnProperty(key)` is likely to cause an error in some cases; see [no-prototype-builtins](no-prototype-builtins). ## Rule Details