Array with object sorting with Underscore sortBy

Question

I have this array. How do I use underscore '_.sortBy' to sort it according to start date?

[     {          id: 'oljw832021kjnb389xzll323jk',         start: { dateTime: '2013-09-26T13:30:00-07:00' },         end: { dateTime: '2013-09-26T14:30:00-07:00' },     },     {          id: 'ed7l5tmckdp0lm90nvr4is3d4c',         start: { dateTime: '2013-09-26T15:30:00-07:00' },         end: { dateTime: '2013-09-26T16:30:00-07:00' },     },     {          id: 'etmasdsackdp0kjl0nvrkopioqw',         start: { dateTime: '2013-09-26T18:00:00-07:00' },         end: { dateTime: '2013-09-26T19:00:00-07:00' },     } ] 

Answer 1

Use an iterator function, not a single string for a property:

_.sortBy(arr, function(o) { return o.start.dateTime; })