I have the following response from a service:
const arrDate = [
{
"id":1,
"birthDate":"2022-06-30T14:38:28.003"
},
{
"id":2,
"birthDate":"2022-06-30T14:36:48.50"
},
{
"id":3,
"birthDate":"2022-06-30T14:35:40.57"
},
{
"id":4,
"birthDate":"2022-06-30T13:09:58.451"
},
{
"id":5,
"birthDate":"2022-06-30T14:11:27.647"
},
{
"id":6,
"birthDate":"2022-06-30T14:55:41.41"
},
{
"id":7,
"birthDate":"2022-02-22T11:55:33.456"
}
]
To sort it by date I do the following:
const sortDate = arrDate.sort(function(a, b) {
return new Date(a.birthDate) > new Date(b.birthDate);
});
But the value of "sortDate" is not correct:
[
{
"birthDate":"2022-06-30T14:38:28.003",
"id":1
},
{
"birthDate":"2022-06-30T14:36:48.50",
"id":2
},
{
"birthDate":"2022-06-30T14:35:40.57",
"id":3
},
{
"birthDate":"2022-06-30T13:09:58.451",
"id":4
},
{
"birthDate":"2022-06-30T14:11:27.647",
"id":5
},
{
"birthDate":"2022-06-30T14:55:41.41",
"id":6
},
{
"id":7,
"birthDate":"2022-02-22T11:55:33.456"
}
]
Should be:
[
{
"birthDate":"2022-06-30T14:55:41.41",
"id":6
},
{
"birthDate":"2022-06-30T14:38:28.003",
"id":1
},
{
"birthDate":"2022-06-30T14:36:48.50",
"id":2
},
{
"birthDate":"2022-06-30T14:35:40.57",
"id":3
},
{
"birthDate":"2022-06-30T14:11:27.647",
"id":5
},
{
"birthDate":"2022-06-30T13:09:58.451",
"id":4
},
{
"id":7,
"birthDate":"2022-02-22T11:55:33.456"
}
]
How can i solve it?, thanks
The problem is that the comparison function is supposed to return a positive number for if a should be after b, negative if b should be after a, and zero if they should keep the same order. Your function is returning true and false, JS converts true to 1 and false to zero. That means you are never telling sort to put b after a.
have the function return
return new Date(a.birthDate) > new Date(b.birthDate) ? -1 : 1;
// copied from a comment
ascending
return new Date(a.birthDate) - new Date(b.birthDate);
descending
return new Date(b.birthDate) - new Date(a.birthDate);