Hassle free Testing Elixir modules in iEx shell
While working on Elixir project, we often test our functions or modules code in
iex shell. Whatever change we make in our code, we fire
iex -S mix command and all of our project modules are accessible in shell.
Suppose, we have a module say
Calculator which is nested under project
mathematics directory . As per Elixir naming convention we are going to name that module as
Mathematics.Calculator. We also implemented some function say
square in this module.
defmodule Mathematics.Calculator do def square(number) do number*number end end
For testing this
square function we fire up
iex shell. In Elixir, we have concept of
alias using it we can avoid writing long module name. Using
alias we can avoid
Mathematics.Calculator, instead we can only use last word i.e
Calculator. Refer example below.
> alias Mathematics.Calculator > Calculator.square(2) #=> 4
This looks fine but what if we add some more modules with deep level nesting modules say
Mathematics.Logirithmic.LogCalculator. It becomes very cumbersome to alias these long named modules every-time we fire
Create a file
.iex.exs at root level of your Elixir project directory. Add all the frequently used or long named alias in the file.
alias Mathematics.Calculator alias Mathematics.Logrithmic.LogCalculator
Next time when you fire up
iex, you don't have to alias these modules again. It will be directly accessible in the shell.
Hope, you like this easy little hack. Let me know your thoughts.