Time string formatter

time-helper.js

/**
 * @function formatTime
 * @param {string} str - string with all times joined with space. Ex: "10s 4m"
 * @returns {string} total time in milliseconds
 */
module.exports = function formatTime(str) {
  let totalTime = 0;
  str.split(' ').forEach((field) => {
    field = field.trim();
    const regex = /(?<time>[0-9]{1,})(?<type>ms|s|m|h|d|w)/gi;
    if (!regex.test(field)) return;
    regex.lastIndex = 0; // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/lastIndex
    let { time, type } = regex.exec(field).groups;
    time = Number(time); // convert "time" to number because of JS.. 0 + "123" = "0123"
    switch (type) {
      case 'ms':
        totalTime += time;
        break;
      case 's':
        totalTime += time * 1000;
        break;
      case 'm':
        totalTime += time * 1000 * 60;
        break;
      case 'h':
        totalTime += time * 1000 * 60 * 60;
        break;
      case 'd':
        totalTime += time * 1000 * 60 * 60 * 24;
        break;
      case 'w':
        totalTime += time * 1000 * 60 * 60 * 24 * 7;
        break;
    }
  });
  return totalTime;
};