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I have an array of objects that are sorted in descending order by date:
_.sortBy
(persons.entities.alerts,
dateObj => new Date(dateObj.createdDateTime)
).reverse()
This is the array:
let persons={
"entities": {
"applicants": [
{
"lastName": "Agamemnon",
"isPrimaryApplicant": true,
"id": "16671520038"
},
{
"lastName": "Purdy",
"isPrimaryApplicant": false,
"id": "16671520039"
},
{
"lastName": "Brekky",
"isPrimaryApplicant": true,
"id": "16671520040"
},
{
"lastName": "Tabouli",
"isPrimaryApplicant": true,
"id": "16671520041"
}
],
"alerts": [
{
"createdDateTime": "2018-06-14T00:00:00.000Z",
"applicants": ["16671520038", "16671520039"],
"id": "05025fea-ec37-4767-a868-a646597365d0"
},
{
"createdDateTime": "2018-06-14T00:00:00.000Z",
"applicants": ["16671520040"],
"id": "19d0da63-dfd0-4c00-a13a-cc822fc83869"
},
{
"createdDateTime": "2018-06-14T00:00:00.000Z",
"applicants": ["16671520041"],
"id": "c5385595-2104-409d-a676-c1b57346f63e"
}
]
}
}
The sort returns the correct order by date desc. In this sample the dates are the same. Only in this case i want to sort by (applicants) lastName where isPrimaryApplicant=true? Link to codepen
399
If orders is unspecified, all values are sorted in ascending order. Otherwise, specify an order of "desc" for descending or "asc" for ascending sort order of corresponding values.
The _. sortBy() method creates an array of elements which is sorted in ascending order by the results of running each element in a collection through each iteratee. And also this method performs a stable sort which means it preserves the original sort order of equal elements.
groupBy , but it does preserve the order of array-like collections, and that's probably unlikely to change. So the sub-items within groups would retain their original ordering, but the grouped key ordering may change, because they are object properties.
Creates an array of elements, sorted in ascending order by the results of running each element in a collection thru each iteratee. This method performs a stable sort, that is, it preserves the original sort order of equal elements.
You want lodash's orderBy, which allows sort directions.
You can attach asc or desc to each sort property you use.
This should get you the ordering you're looking for:
_.orderBy(persons.entities.applicants, ['lastName'], ['desc'])
200
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