# Type Sudoku (test if object is a struct)

**URL:** <https://discourse.julialang.org/t/type-sudoku-test-if-object-is-a-struct/66139>\
**Category:** Performance\
**Tags:** type, dispatch\
**Created:** [August 10, 2021, 2:51pm UTC](https://discourse.julialang.org/t/type-sudoku-test-if-object-is-a-struct/66139 "2021-08-10T14:51:11Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![Bardo](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/bardo/32/21601_2.png) [@Bardo](https://discourse.julialang.org/u/Bardo)\
**Post date:** [August 10, 2021, 9:24pm UTC](https://discourse.julialang.org/t/type-sudoku-test-if-object-is-a-struct/66139/15 "2021-08-10T21:24:30Z")

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Probably no other language has such a large bandwidth from highest (Metaprogramming.jl, Symbolics.jl, Modia.jl) to these levels where the programmer can assist the compiler.

Thanks for sharing this background insight, see also [this](https://discourse.julialang.org/t/intermediate-results-dereferencing-cse-when-to-avoid/66024/3) and [this](https://discourse.julialang.org/t/intermediate-results-dereferencing-cse-when-to-avoid/66024/3).

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