ColorfulNumbers

function nums(n) {
    let html = '<ul>\n';

    for (let i = 1; i <= n; i++) {
      let color = 'blue';
      if (i % 2 != 0) color = 'green';
      html += ` <li><span style='color:${color}'>${i}</span></li>\n`;
    }

    html += '</ul>';

    return html;
}