# Findfirst() with Dict for which nothing is a valid key

**URL:** <https://discourse.julialang.org/t/findfirst-with-dict-for-which-nothing-is-a-valid-key/9141>\
**Category:** Internals & Design\
**Created:** [February 18, 2018, 12:32am UTC](https://discourse.julialang.org/t/findfirst-with-dict-for-which-nothing-is-a-valid-key/9141 "2018-02-18T00:32:10Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![nalimilan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/nalimilan/32/147_2.png) [@nalimilan](https://discourse.julialang.org/u/nalimilan)\
**Post date:** [February 18, 2018, 11:17am UTC](https://discourse.julialang.org/t/findfirst-with-dict-for-which-nothing-is-a-valid-key/9141/3 "2018-02-18T11:17:01Z")

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See also previous discussion at [Suggestion for more general/performant sentinel for find\* functions - #4 by ScottPJones](https://discourse.julialang.org/t/suggestion-for-more-general-performant-sentinel-for-find-functions/8657/4).

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_[View the full topic](https://discourse.julialang.org/t/findfirst-with-dict-for-which-nothing-is-a-valid-key/9141)._