Clone the repo to a local_folder
git clone https://github.com/DrBoolean/mostly-adequate-guide.git
change directory to the code folder in repository root
cd /path/to/local_folder/mostly-adequate-guide/code/part1_exercises/
install dependencies
npm install
# this picks up the dependencies from package.json and installs them
run the test runner with the spec file for that exercise
# for example
mocha exercises/curry/curry_exercises_spec.js -w
this brings up the mocha test runner which shows the error immediately when you save the file with changed code. Achieve the requested refactor while keeping all the arrows green.