Workflow Tips

Workflow Tips

Here are some tips for working with Julia efficiently.

REPL-based workflow

As already elaborated in The Julia REPL, Julia's REPL provides rich functionality that facilitates an efficient interactive workflow. Here are some tips that might further enhance your experience at the command line.

Command-line-based basic editor/REPL workflow

The most basic Julia workflows involve using a text editor in conjunction with the julia command line. A common pattern includes the following elements:

  $ julia -e 'using Pkg;Pkg.generate("Tmp")'
Generating project Tmp:
    Tmp/Project.toml
    Tmp/src/Tmp.jl
  $ ls -R Tmp
Tmp:
Project.toml  src

Tmp/src:
Tmp.jl
  $ cat -n Tmp/src/Tmp.jl
     1	module Tmp
     2
     3	greet() = print("Hello World!")
     4
     5	end # module
  ```

  * **Create a test folder**
  ```
  $ mkdir Tmp/test
  ```
  * **Put your test code in `test/runtests.jl` file.**

    ```
    $ cat -n Tmp/test/runtests.jl
     1	using Tmp
     2	Tmp.greet()
    ```

  * **Run test**
  ```
  $ julia  -e 'using Pkg;Pkg.activate("Tmp");Pkg.test()'
  Updating registry at `~/.julia/registries/General`
  Updating git-repo `https://github.com/JuliaRegistries/General.git`
 Resolving package versions...
  Updating `~/Tmp/Project.toml`
 [no changes]
   Testing Tmp
 Resolving package versions...
Hello World!   Testing Tmp tests passed
  ```
  * **Lather. Rinse. Repeat.** Explore ideas at the `julia` command prompt. Save good ideas in `Tmp.jl` and test with `runtests.jl`.

## Simplify initialization

To simplify restarting the REPL, put project-specific initialization code in a file, say `_init.jl`,
which you can run on startup by issuing the command:

julia -L _init.jl


If you further add the following to your `~/.julia/config/startup.jl` file

julia isfile("init.jl") && include(joinpath(pwd(), "init.jl")) ```

then calling julia from that directory will run the initialization code without the additional command line argument.

Browser-based workflow

It is also possible to interact with a Julia REPL in the browser via IJulia. See the package home for details.