Codewars-challenges My code on codewars use ES2015 syntax Prerequisite NodeJS(always) command: npm install Dev depedencies ES2015 compiler babel-cli babel-preset-es2015 Dev depedencies testing babel-register mocha chai Dev depedencies code style formatter jscs --preset airbnb command: jscs [[path]] --preset airbnb How to run test command: npm test Referrals codewars.com