Julia 1.0 Programming Complete Reference Guide

Setting up the LOAD_PATH

Let's look at some examples that illustrate scoping rules when working with modules. Please open a new Julia REPL.

We've seen the using statement many times throughout the previous chapters, and now we understand its role—to bring another module and its definitions (variables, functions, types) into scope. Let's try it with our newly created modules:

julia> using Letters 
ERROR: ArgumentError: Package Letters not found in current path: 
- Run `Pkg.add("Letters")` to install the Letters package. 

Ouch, an exception! Julia informs us that it doesn't know where to find the Letters module and advises us to use Pkg.add("Letters") to install it. But, since Pkg.add only works with registered packages and we haven't published ...