Excellent cheat-sheet

[nickeubank]

Immutable types are passed around by value (i.e. copying), whereas mutable types are passed by reference.

I’m not sure this is really true. Since you can’t modify an immutable struct it doesn’t matter if you copy it or not to pass it as an argument, and the compiler can chose what to do. Also, I don’t think there is anything called “pass by reference” in Julia. What I think it is typically called is “pass by value” and this is true both for mutables and immutables.

[Edit: got correct quote this time]

Happy to change, but I’ll confess I’m a little confused, as this is what’s in the Julia official docs:

[nickeubank]

@kristoffer.carlsson and @Elrod : OK, think I addressed most of these in this PR. Few followups:

Free up memory for large arrays with arr = nothing

That’s not true in interactive programming, unfortunately, which I know some of us still use.

Moreover, using only loads exported names by default while import loads all names defined in the module.

I think it means that import will load all functions defined in a module, while using only imports the exported functions. Tried to clarify.

[ScottPJones]

@nickeubank

I think it means that import will load all functions defined in a module, while using only imports the exported functions. Tried to clarify.

No - see the section in the manual about the differences between import and using:
https://docs.julialang.org/en/latest/manual/faq/#What-is-the-difference-between-“using”-and-“import”?-1

Maybe you were thinking of importall, which I believe has been deprecated.

[nickeubank]

No - see the section in the manual about the differences between import and using:

https://docs.julialang.org/en/latest/manual/faq/#What-is-the-difference-between-“using”-and-“import”?-1

ah, ok thanks! Will revert.

[mortenpi]

The cheat sheet has been moved to the JuliaDocs org now, so the URL changed to https://juliadocs.github.io/Julia-Cheat-Sheet/

It would probably be nice to update the link in the OP as well, in case someone stumbles onto this thread in the future.

[nickeubank]

done!

[DrKrar]

I think this cheat-sheet very useful and concise.
https://cheatsheets.quantecon.org/julia-cheatsheet.html

[joa-quim]

But many things in it are no longer valid in 1.0

[purplishrock]

ComplexN should be Complex{T}

[chakravala]

is there a PDF available somewhere?

[nickeubank]

I started an issue discussion of needed updates here

[Yifan_Liu]

Can we have a collection of cheat sheets of Julia and the popular libraries like this one:

https://www.rstudio.com/resources/cheatsheets/

[DrKrar]

you are right but this the case for many non-offical docs. joa-quim

[nickeubank]

https://juliadocs.github.io/Julia-Cheat-Sheet/ is updated for Julia 1.0 now!

[Yifan_Liu]

Do you have a offline pdf version of the cheat sheet?

[tlienart]

Printing from browser gave me a decent, compact pdf which may be what you’re looking for.

[chakravala]

It would be nice if the PDF could be specifically created to fit on a single 2-sided paper.

[nickeubank]

PRs welcome!

The cheatsheet is fully flexible in terms of format (it’s in markdown / html), so if you can’t fit everything on one sheet, you could just subset the blocks you think are most useful, build it, and print to PDF in any web browser!