Lodash - Move object to first place in array than sort by another property

Question

I have an array of object employees

    {
  "emp1": {
    "BusinessPartnerFormattedName": "Aleksandra Lewandowski",
    "EmpRoleCode": "BUP003",
    "EmpRoleType": "Employee",
    "EmployeeID": "E8000",
    "isAssigned" : true,
    "ObjectID": "00163E0E46241ED7A0EA0590D0655967"
  },
  "emp2": {
    "BusinessPartnerFormattedName": "Aleksandra Lewandowski",
    "EmpRoleCode": "BUP003",
    "EmpRoleType": "Employee",
    "EmployeeID": "E8000",
    "isAssigned" : true,
    "ObjectID": "00163E0E46241ED7A0EA0590D0655967"
  },
  "emp3": {
    "BusinessPartnerFormattedName": "Aleksandra Lewandowski",
    "EmpRoleCode": "BUP003",
    "EmpRoleType": "Employee",
    "EmployeeID": "E8000",
    "isAssigned" : false,
    "ObjectID": "00163E0E46241ED7A0EA0590D0655967"
  },
  "emp4": {
    "BusinessPartnerFormattedName": " Lewandowski",
    "EmpRoleCode": "BUP803",
    "EmpRoleType": "Employee",
    "EmployeeID": "BUP803",
    "isAssigned" : false,
    "ObjectID": "00163E0E46241ED7A0EA0590D0655967"
  },
  "emp5": {
    "BusinessPartnerFormattedName": "Aleksandra",
    "EmpRoleCode": "BUP043",
    "EmpRoleType": "Employee",
    "EmployeeID": "BUP043",
    "isAssigned" : false,
    "ObjectID": "00163E0E46241ED7A0EA0590D0655967"
  },
  "emp6": {
    "BusinessPartnerFormattedName": "Eva Log",
    "EmpRoleCode": "BUP0d03",
    "EmpRoleType": "Employee",
    "EmployeeID": "BUP0d03",
    "isAssigned" : false,
    "ObjectID": "00163E0E46241ED7A0EA0590D0655967"
  }
}

I would like to put the employee where EmployeeID is equal to E8000 first in list , than I want the employee where isAssigned is equal to true to follow

So far I've achieved this :

var sortedItems = _.sortBy(items, function(item) {
  return (item.isAssigned === true || item.EmployeeID === "E8000") ? 0 : 1;
});

But how to make sure that the emp with EmployeeID is equal E8000 to will always be on top ?

Answer 1

Not sure why you need lodash on this:

items.sort((a,b)=>{
    if(a.EmployeeID !== b.EmployeeID){
        if(a.EmployeeID === 'E8000') return -1;
        if(b.EmployeeID === 'E8000') return 1;
    };

    if(a.isAssigned !== b.isAssigned){
        return a.isAssigned ? -1 : 1;
    }

    //Remaining sort logic...
})

This translates to:

"When deciding if a or b should come first, if a and b don't both have the same EmployeeID value, check if either has value E8000 . If ether one does have that value, put that one first.

Otherwise, check if a and b have the same value for isAssigned , if they don't, put the one that has true as the isAssigned value first.

Finally if the prior conditions weren't met, follow whatever logic you want for setting which should go first.

Of course, you have to fill in whatever sort logic you want to come after that. For example, if you want to sort alphabetically on BusinessPartnerFormattedName , you'd fill that Remaining sort logic... block with:

if(a.BusinessPartnerFormattedName < b.BusinessPartnerFormattedName) return -1;
if(a.BusinessPartnerFormattedName > b.BusinessPartnerFormattedName) return 1;
return 0;

Answer 2

You chain the wanted sort order.

 var array = [ { name: "E8000 true", EmployeeID: "E8000", isAssigned : true }, { name: "E8000 true", EmployeeID: "E8000", isAssigned : true }, { name: "E8003 false", EmployeeID: "E8003", isAssigned : false }, { name: "E8001 true", EmployeeID: "E8001", isAssigned : true }, { name: "E8002 true", EmployeeID: "E8002", isAssigned : true }, { name: "E8001 false", EmployeeID: "E8001", isAssigned : false } ]; array.sort((a, b) => (b.EmployeeID === 'E8000') - (a.EmployeeID === 'E8000') || b.isAssigned - a.isAssigned ); console.log(array);

 .as-console-wrapper { max-height: 100% !important; top: 0; }

With lodash

 var array = [ { name: "E8000 true", EmployeeID: "E8000", isAssigned : true }, { name: "E8000 true", EmployeeID: "E8000", isAssigned : true }, { name: "E8003 false", EmployeeID: "E8003", isAssigned : false }, { name: "E8001 true", EmployeeID: "E8001", isAssigned : true }, { name: "E8002 true", EmployeeID: "E8002", isAssigned : true }, { name: "E8001 false", EmployeeID: "E8001", isAssigned : false } ]; console.log(_.sortBy(array, [ o => o.EmployeeID !== 'E8000', o => !o.isAssigned ]));

 .as-console-wrapper { max-height: 100% !important; top: 0; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>

Answer 3

The data you provided is highly misleading, however I still would like to publish my solution, because basically I just like it.

 const items = [{BusinessPartnerFormattedName:"Aleksandra Lewandowski",EmpRoleCode:"BUP003",EmpRoleType:"Employee",EmployeeID:"E7000",isAssigned:!0,ObjectID:"00163E0E46241ED7A0EA0590D0655967"},{BusinessPartnerFormattedName:"Aleksandra Lewandowski",EmpRoleCode:"BUP003",EmpRoleType:"Employee",EmployeeID:"E6000",isAssigned:!1,ObjectID:"00163E0E46241ED7A0EA0590D0655967"},{BusinessPartnerFormattedName:"Aleksandra Lewandowski",EmpRoleCode:"BUP003",EmpRoleType:"Employee",EmployeeID:"E8000",isAssigned:!1,ObjectID:"00163E0E46241ED7A0EA0590D0655967"}]; const helper = (emp) => emp.EmployeeID === 'E8000' ? 2 : +(!!emp.isAssigned); const r = items.sort((a, b) => helper(b) - helper(a)); console.log(r);