Your task in order to complete this Kata is to write a function which formats a duration, given as a number of seconds, in a human-friendly way. The function must accept a non-negative integer. If it is zero, it just returns "now". Otherwise, the duration is expressed as a combination of years, days, hours, minutes and seconds. https://www.codew…

Human readable duration format

function formatDuration (sec) {
          if(sec == 0)
            return 'now';
         let s = sec % 60;
          let m = Math.floor((sec % 3600) / 60);
          let h = Math.floor((sec % 86400) / 3600);
          let d = Math.floor((sec % 31536000) / 86400);
          let Y = Math.floor(sec / 31536000);
          let string = '';
          let flag = false;
          if(Y) {
            string += (Y == 1 ? (flag ?  ', ':'')  + Y + ' year' : (flag ?  ', ':'') + Y + ' years');
            flag = true;
          }
          if(d) {
            string += (d == 1 ? (flag ?  ', ':'')  + d + ' day' : (flag ?  ', ':'') + d + ' days');
            flag = true;
          }
          if(h) {
            string += (h == 1 ? (flag ?  ', ':'') + h + ' hour' : (flag ?  ', ':'') + h + ' hours');
            flag = true;
          }
          if(m) {
            string += (m == 1 ? (flag ?  (s ? ', ' : ' and ') :'') + m + ' minute' : (flag ?  (s ? ', ' : ' and ') :'') +  m + ' minutes');
            flag = true;
          }
          if(s) {
            string += (s == 1 ? (flag ?  ' and ':'') + s + ' second' : (flag ?  ' and ':'') + s + ' seconds');
          }
        return string;
}