如何根据日期对对象数组进行排序

Question

I have an array of objects which I am attempting to sort based on the createDate .

[{
    "TestName": "com.DPProgram",
    "Test": {
        "createDate": "2018-02-15T17:17:10.000+0530",
        "effectiveStartDate": "1900-01-01T00:00:00.000+0530",
        "effectiveEndDate": "2200-01-01T00:00:00.000+0530"
    }
}, {
    "TestName": "com.DPProgram",
    "Test": {
        "createDate": "2018-02-22T15:00:11.000+0530",
        "effectiveStartDate": "2017-12-22T00:00:00.000+0530",
        "effectiveEndDate": "2018-12-23T00:00:00.000+0530"
    }
}];

data = data.sort(function(a, b) {
  data = data.sort(function(a, b) {
    return (a[data.createDate] > b[data.createDate]) 
  });

However it's not sorting

https://jsfiddle.net/o2gxgz9r/51545/

Answer 1

You are comparing the dates as strings. You need to instead convert them to Date objects before making the comparison.

Also your syntax of a[data.bean.createDate] is broken given the example. You need to access obj.Test.createDate instead.

Finally, don't use alert() for debugging, and especially not for any datatype more complex than a string. console.log() is more accurate as it doesn't coerce data types, and lets you traverse through the levels or objects/arrays.

With all that said, try this:

 var data = [{ "TestName": "com.DPProgram", "Test": { "createDate": "2018-02-15T17:17:10.000+0530", "effectiveStartDate": "1900-01-01T00:00:00.000+0530", "effectiveEndDate": "2200-01-01T00:00:00.000+0530" } }, { "TestName": "com.callidus.quotaDP.Tests.DPProgram", "Test": { "createDate": "2018-02-22T15:00:11.000+0530", "effectiveStartDate": "2017-12-22T00:00:00.000+0530", "effectiveEndDate": "2018-12-23T00:00:00.000+0530" } }, { "TestName": "com.Foo", "Test": { "createDate": "2018-02-07T15:00:11.000+0530", "effectiveStartDate": "2017-12-22T00:00:00.000+0530", "effectiveEndDate": "2018-12-23T00:00:00.000+0530" } }]; data = data.sort(function(a, b) { var aDate = new Date(a.Test.createDate), bDate = new Date(b.Test.createDate); return aDate > bDate ? 1 : aDate < bDate ? -1 : 0; }); console.log(data); 

Answer 2

 var data = [{ "TestName": "com.DPProgram", "Test": { "createDate": "2018-02-15T17:17:10.000+0530", "effectiveStartDate": "1900-01-01T00:00:00.000+0530", "effectiveEndDate": "2200-01-01T00:00:00.000+0530" } }, { "TestName": "com.DPProgram", "Test": { "createDate": "2018-02-22T15:00:11.000+0530", "effectiveStartDate": "2017-12-22T00:00:00.000+0530", "effectiveEndDate": "2018-12-23T00:00:00.000+0530" } },{ "TestName": "com.DPProgram", "Test": { "createDate": "2018-02-25T15:00:11.000+0530", "effectiveStartDate": "2017-12-22T00:00:00.000+0530", "effectiveEndDate": "2018-12-23T00:00:00.000+0530" } }]; console.log(_.sortBy(data, 'createDate')); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore.js"></script> 

Answer 3

When you use a sort function, you get two arguments that are elements of the data array you are operating on, and so you need to use them:

data.sort(function(a, b) {
    return a.Test.createDate - b.Test.createDate;
});