import Roots; var generate = document.getElementById('generate'); var result = document.getElementById('result'); function random(roots) { var i = Math.floor(roots.length * Math.random()); return roots[i]; } function name() { var prefix = random(Roots.prefixes); var suffix = random(Roots.suffixes); return prefix + suffix; } generate.addEventListener('click', function() { result.textContent = "Gloire à " + name() + " !"; });