# \#nothing

**URL:** https://discourse.julialang.org/tag/nothing/1046.md

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## [Isusefulnumber()](https://discourse.julialang.org/t/isusefulnumber/93795)

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**Author:** [@ellocco](https://discourse.julialang.org/u/ellocco)\
**Replies:** 2\
**Last updated:** [January 30, 2023, 10:24pm UTC](https://discourse.julialang.org/t/isusefulnumber/93795 "2023-01-30T22:24:45Z")

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Is there a function available to check in a large vector, if one of the following occurs in a vector: missing nothing Inf NaN ? Here is my snippet to investigate a vector for such elements: a = \[1.3, NaN, Inf, missi…

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## [Are "inline assignments" inside loop predicates bad for type inference?](https://discourse.julialang.org/t/are-inline-assignments-inside-loop-predicates-bad-for-type-inference/81855)

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**Author:** [@Krastanov](https://discourse.julialang.org/u/Krastanov)\
**Replies:** 4\
**Last updated:** [June 2, 2022, 12:55am UTC](https://discourse.julialang.org/t/are-inline-assignments-inside-loop-predicates-bad-for-type-inference/81855 "2022-06-02T00:55:36Z")

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I was playing with JET and noticed that it does not like notation like while (i=f())!==nothing ... while it is perfectly happy with i=f(); while i!==nothing .... f is a function that returns Union{Int,Nothing}. It seems …