Questions about .reduce() and .sort() method in javascript and one challenge

Question

Can I ask what are the uses of these two methods? Can someone propose some examples so that me as well as the others can refer on?
Here is a challenge : Given an array of time , example:
var durations = ["12:38", "6:36", "9:03", "8:34", "5:02", "6:54", "13:22", "4:41", "8:36", "21:58", "3:06", "10:46", "10:13", "12:54", "14:00", "11:03", "16:03", "10:52", "24:53", "10:03", "11:49", "15:47", "3:19", "2:06", "5:47", "1:03", "5:29", "5:47", "26:39"]
take the sum of hours and minutes and show them in the f

Answer 1

For usage of sort and reduce methods together, please check out this challenge:

https://code.sololearn.com/WZCL8wTUyKSO/?ref=app

Answer 2

https://code.sololearn.com/WbTSSS96Xiiw/?ref=app

Just accept only challenge
+I added round sec bc 24:53 is not existed in my dialog clock

Answer 3

I use reduce, but not use sort method.
https://code.sololearn.com/WvcCecQ7BC3T/?ref=app

Answer 4

thanks bro!!

Answer 5

have fun guys idk the answer