convertMinutesToHours.js

/**
 * Convert a whole number of minutes into an hour/minute string
 * @param  {number} m number of minutes, will be truncated
 * @return {string}   string of converted time in hours/minutes
 *                    Example: 1hr, 1hr 40 min, 2 hrs 15 min
 */
function convertMinutesToHours(m) {
  // truncate number of minutes
  m = Math.floor(m);
  
  var hours = Math.floor(m / 60);
  var minutes = m % 60;
  var output = "";
 
  if(hours > 0) {
    output += String(hours) + " ";
    output += (hours > 1) ? "hrs" : "hr";
  }

  if(minutes > 0) {
     if(output.length > 0) output += " ";
     output += String(minutes) + " min";
 }
  return output;
}