# Why Julia returns error on myit .+ 1 in the following code?

**URL:** <https://discourse.julialang.org/t/why-julia-returns-error-on-myit-1-in-the-following-code/15021>\
**Category:** General Usage\
**Created:** [September 16, 2018, 4:26pm UTC](https://discourse.julialang.org/t/why-julia-returns-error-on-myit-1-in-the-following-code/15021 "2018-09-16T16:26:41Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![AdamR](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/adamr/32/5109_2.png) [@AdamR](https://discourse.julialang.org/u/AdamR)\
**Post date:** [September 16, 2018, 11:28pm UTC](https://discourse.julialang.org/t/why-julia-returns-error-on-myit-1-in-the-following-code/15021/7 "2018-09-16T23:28:42Z")

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Here are my sources of information, so far:

1. The manual (specifically the chapters about arrays, interfaces and broadcasting)
2. The talk by Matt Bauman on the JuliaCon 2018 in London ([An introduction to high performance custom arrays | Matt Bauman - YouTube](https://www.youtube.com/watch?v=jS9eouMJf_Y)(
3. Matt Bauman’s post in the discourse: [How to customize the new broadcasting infrastructure in v0.7 - #4 by mbauman](https://discourse.julialang.org/t/how-to-customize-the-new-broadcasting-infrastructure-in-v0-7/11322/4)
4. [JuliaLang.org](http://JuliaLang.org) blog entry about the broadcast function in 0.7 ([Extensible broadcast fusion](https://julialang.org/blog/2018/05/extensible-broadcast-fusion))

I almost never read the source code. I still hope to get a higher level explanation from the devs. :-)…

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