Transformation: Fetch from GitHub
Now let’s continue down our data-transformation chain. Having parsed our arguments, we need to transform them by fetching data from GitHub. So we’ll extend our run function to call a process function, passing it the value returned from the parse_args function. We could have written this:
| process(parse_args(argv)) |
But to understand this code, you have to read it right to left. I prefer to make the chain more explicit using the Elixir pipe operator:
| def run(argv) do |
| argv |
| |> parse_args |
| |> process |
| end |
We need two variants of the process function. One handles the case where the user asked for help and parse_args returned :help. The other handles the case where a ...
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