Here's how you prototype:

npm install -g react-native

react-native init myproject

cd myproject

# open xcode simulator or android emulator

# make changes to index.ios.js and read the damn docs

# otherwise you end up dragging slides and dragging drop

# having no idea what actually goes on behind the scenes

# when if you learned what went on behind the scenes

# you could code so so much faster and have so much more control