TIL, 2017-03-23: Welcome to React

Grok webpack now hehe.
Create react app. then npm start
package.json has stuff there that you can tinker, the scripts part contains scripts you can run via npm ACTION (ex: "start": "PORT=3006 react-scripts start").
ES6: Constructor, that is where you set React initial state.
Gitlab code, testing module inclusion: it { is_expected.to include_module(Mentionable) }

Gitlab code, testing caches:

it 'caches the author' do
  user = create(:user, email: commit.author_email)
  expect(RequestStore).to receive(:active?).twice.and_return(true)
  expect_any_instance_of(Commit).to receive(:find_author_by_any_email).and_call_original

  expect(commit.author).to eq(user)
  key = "commit_author:#{commit.author_email}"
  expect(RequestStore.store[key]).to eq(user)

  expect(commit.author).to eq(user)
  RequestStore.store.clear
end

React way of thinking, though stuck on two parts: How to do presenter type stuff in a Component, and sharing state across components.
Doing an Enumerable.map with a conditional inside then Enumerable.compact is like the same as Enumerable.select.
Elixir package manager: hex.