WestKeys
Keyword.fetch vs bracket access []
Hi everyone,
I’m currently going through the Getting Started and I have encountered the following:
defmodule KV.Registry do
use GenServer
def start_link(opts) do
# 1. Pass the name to GenServer's init
server = Keyword.fetch!(opts, :name)
GenServer.start_link(__MODULE__, server, opts)
end
(...)
Why not write server = opts[:name] ? Is it exclusively to instruct the app to raise a KeyError if not found?
Marked As Solved
lud
Yes, the example relies on the server to have a name, so you would rather crash sooner than later.
@doc """
Starts the registry with the given options.
`:name` is always required.
"""
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