# Julia is a very different and interesting language

**URL:** <https://discourse.julialang.org/t/julia-is-a-very-different-and-interesting-language/10741>\
**Category:** New to Julia\
**Created:** [May 6, 2018, 11:55am UTC](https://discourse.julialang.org/t/julia-is-a-very-different-and-interesting-language/10741 "2018-05-06T11:55:54Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![RoyiAvital](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/royiavital/32/571_2.png) [@RoyiAvital](https://discourse.julialang.org/u/RoyiAvital)\
**Post date:** [May 7, 2018, 4:11am UTC](https://discourse.julialang.org/t/julia-is-a-very-different-and-interesting-language/10741/11 "2018-05-07T04:11:35Z")

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For instance I encountered [this](https://discourse.julialang.org/t/efficient-linear-algebra-for-large-scale-problems-in-jump/10715/3):

> [@Efficient linear algebra for large-scale problems in JuMP](https://discourse.julialang.org/t/efficient-linear-algebra-for-large-scale-problems-in-jump/10715/3):
>
> ```julia
> A*x*B
> 
> ```
> 
> where `A<:AbstractMatrix{<:Number}`, `B<:AbstractMatrix{<:Number}`, `x<:AbstractSparseMatrix{JuMP.Variable}`.

I think it’s me but this frighten me :-).  
I understand simple types (Int, Float, Double) and structures (Array, Struct, etc…).  
Then I see this…

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