ScriptdrillFormat a duration
A JavaScript exercise from Scriptdrill. Solve it with a code editor in your browser that runs your function against example and hidden tests, and it is checked the moment you submit.
The task
Format a whole number of seconds like `"1d 2h 3m 4s"`, using days, hours, minutes and seconds, largest first. Leave out units that are zero. Zero seconds is `"0s"`.
What this exercise teaches
Taking the largest unit first and carrying the remainder down gives each unit its share. Zero parts are skipped, and joining an empty list gives "", which the fallback turns into "0s".
A hint if you get stuck
Go through `[["d", 86400], ["h", 3600], ["m", 60], ["s", 1]]`. For each unit take `Math.floor(rest / size)`, keep it when it is not zero, and subtract it from the rest.
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