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' },
    }
]

Bergi · Accepted Answer · 2013-09-30 09:24:48Z

169

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

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

answered Sep 30, 2013 at 9:24

Bergi

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7 Comments

Robin Over a year ago

it gives in ascending order, but how to sort it descending order of date ?

Bergi Over a year ago

@RobinAT: You simply could negate the datetime

JrBriones Over a year ago

if you want to do descending order, then just do arr.reverse()

imdadhusen Over a year ago

if you want descending order of date then use below _.sortBy(arr, function(o) { var dt = new Date(o.start.dateTime); return -dt; })

Bergi Over a year ago

@imdadhusen: Yes, that's what I meant when I said "negate the datetime". However, that Date object is superfluous, you can just do return -o.start.dateTime;

|

Sanchitos · Accepted Answer · 2015-11-24 17:53:32Z

2

I did it this way:

var sorted = _(list).sortBy(
                    function (item) {                        
                        return [new Date(item.effectiveDate).getTime(), item.batchId];
                    }), "batchId");

If you want it descending then it's the same thing but *-1

var sorted = _(list).sortBy(
                    function (item) {                        
                        return [new Date(item.effectiveDate).getTime()*-1, item.batchId];
                    }), "batchId");

In this example I am ordering by two fields, you can forget about the item.batchId.

Hope this helps someone.

answered Nov 24, 2015 at 17:53

Sanchitos

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Comments

inshu choudhary · Accepted Answer · 2020-01-09 04:48:34Z

1

var sortedItem = _.sortBy(yourArrayName, ["start"])

answered Jan 9, 2020 at 4:48

inshu choudhary

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