[`jQuery#has`](https://api.jquery.com/has/) is a filter which returns the subset of a collection's elements which match the selector. `jBone#has` (which is [implemented](https://github.com/kupriyanenko/jbone/blob/80b99258ef0fcd23f9d7451fbe4d87e73ded94f1/src/traversing.js#L61-L67) but [undocumented](https://github.com/kupriyanenko/jbone/wiki/Traversing)) returns a boolean indicating the existence of matches.
jQuery#hasis a filter which returns the subset of a collection's elements which match the selector.jBone#has(which is implemented but undocumented) returns a boolean indicating the existence of matches.