Finding "spare time" in a day from within a list of events

Posted by MFB on Programmers See other posts from Programmers or by MFB
Published on 2014-08-25T06:22:07Z Indexed on 2014/08/25 10:32 UTC
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JavaScript

|

algorithms

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loops

I have a list of events which is always sorted chronologically. The start time is always followed by the end time. Times are strings formatted as 'HHmmss'.

// list of events

var events = [
    '010000',  // start
    '013000',  // end...
    '053000',
    '060000',
    '161500',
    '184500']

// desired output

var spares = [
    '000000',  // start
    '010000',  // end...
    '013000',
    '053000',
    '060000',
    '161500',
    '184500',
    '235959']

How can I programmatically create a new list of "spare time" from 000000 to 235959?

PS I'm trying to do this in Javascript, but any conceptual answer or pseudo code would be helpful too.

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