Detect semver release

index.js

const assert = require('assert');

function version(semver) {
  const indexes = [
    'major',
    'minor',
    'patch',
  ];

  return semver.split('.').reduce((classification, number, index) => {
    return (number !== '0') ? indexes[index] : classification;
  }, indexes[0]);
}

assert(version('1.2.0') === 'minor');
assert(version('2.0.0') === 'major');
assert(version('2.0.2') === 'patch');
assert(version('0.0.2') === 'patch');
// All pass