如何按日期对对象数组进行排序？

Question

I am trying to sort an array of objects with each object containing:

var recent = [{id: "123",age :12,start: "10/17/13 13:07"} , {id: "13",age :62,start: "07/30/13 16:30"}];

Date format is: mm/dd/yy hh:mm .

I want to sort in order of date with the most recent first. If date is same it should be sorted by their time parts.

I tried out the below sort() function, but it is not working:

recent.sort(function(a,b))
{
    a = new Date(a.start);
    b = new Date(b.start);
    return a-b;
});

Also how should I iterate over the objects for sorting? Something like:

for (var i = 0; i < recent.length; i++)
    {
        recent[i].start.sort(function (a, b)
        {
            a = new Date(a.start);
            b = new Date(b.start);
            return a-b; 
        } );
    }

There can be any number of objects in the array.

Answer 1

As has been pointed out in the comments, the definition of recent isn't correct javascript.

But assuming the dates are strings:

var recent = [
    {id: 123,age :12,start: "10/17/13 13:07"}, 
    {id: 13,age :62,start: "07/30/13 16:30"}
];

then sort like this:

recent.sort(function(a,b) { 
    return new Date(a.start).getTime() - new Date(b.start).getTime() 
});

More details on sort function from W3Schools

Answer 2

recent.sort(function(a,b) { return new Date(a.start).getTime() - new Date(b.start).getTime() } );

Answer 3

This function allows you to create a comparator that will walk a path to the key you would like to compare on:

 function createDateComparator ( path = [] , comparator = (a, b) => a.getTime() - b.getTime()) { return (a, b) => { let _a = a let _b = b for(let key of path) { _a = _a[key] _b = _b[key] } return comparator(_a, _b) } } const input = ( [ { foo: new Date(2017, 0, 1) } , { foo: new Date(2018, 0, 1) } , { foo: new Date(2016, 0, 1) } ] ) const result = input.sort(createDateComparator([ 'foo' ])) console.info(result) 

Answer 4

ES6：

recent.sort((a,b)=> new Date(b.start).getTime()-new Date(a.start).getTime());