Create formatDuration.md

snippets/formatDuration.md

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+###formatDuration
+
+Returns the human readable format of the given number of milliseconds. If milliseconds is equal to `0` return `'now'` .
+
+``` js
+const formatDuration = milliseconds => {
+if(milliseconds === 0) return 'now'
+if(milliseconds < 0) milliseconds = -milliseconds
+const join = (arr, separator = ',', end = separator) =>
+  arr.reduce(
+    (acc, val, i) =>
+      i == arr.length - 2
+        ? acc + val + end
+        : i == arr.length - 1 ? acc + val : acc + val + separator,
+    ''
+  );
+const pluralize = (num, word, plural = word + 's') =>
+    Number(num) === 1 ? word : plural;
+  let date = new Date(milliseconds)
+  let array = [date.getUTCMilliseconds(),date.getUTCSeconds(),date.getUTCMinutes(),date.getUTCHours(),date.getUTCDate()-1,date.getUTCMonth(),date.getUTCFullYear()-1970]
+  let time = ["millisecond","second","minute","hour","day","month","year"]
+  array = array.map((el,i) => [el,time[i]]).filter(el => el[0] !== 0).map(el => [el[0],pluralize(el[0],el[1])]).map(el => el[0] + ' ' + el[1])
+  return join(array.reverse(),', ',' and ')
+}
+```