# \#predicate **URL:** https://racket.discourse.group/tag/predicate/175.md [Latest](https://racket.discourse.group/latest.md) · [Categories](https://racket.discourse.group/categories.md) · [Tags](https://racket.discourse.group/tags.md) --- ## [Predicate to check for \`(values)\`?](https://racket.discourse.group/t/predicate-to-check-for-values/2012)
**Author:** [@sschwarzer](https://racket.discourse.group/u/sschwarzer)\ **Replies:** 4\ **Last updated:** [June 15, 2023, 8:53am UTC](https://racket.discourse.group/t/predicate-to-check-for-values/2012 "2023-06-15T08:53:52Z")
If I define a generator (require racket/generator) (define a-generator (generator () (yield 1) (yield 2))) and call a-generator repeatedly, I get \> (a-generator) 1 \> (a-generator) 2 \> (a-generator) \> (a-gen…