I have an array :
var array = [
{ID : 1,
Name : one,
data : {more info here}
},
{ID : 2,
Name : two
},
{ID : 3,
Name : three,
data : {more info here}
},
{ID : 4,
Name : four
},
{ID : 5,
Name : five,
data : {more info here}
},]
Need to sort these array, where data is present will be top, then other. Final sort result will be -
[{ID:1,name: one,data: {}},
{ID:3,name: three,data: {}},
{ID:5,name: five,data: {}},
{ID:2,name: two},
{ID:4,name: four}]
You could use the delta of the boolen values of the properties.
var array = [{ ID: 1, Name: 'one', data: {} }, { ID: 2, Name: 'two' }, { ID: 3, Name: 'three', data: {} }, { ID: 4, Name: 'four' }, { ID: 5, Name: 'five', data: {} }];
array.sort(function (a, b) {
return !a.data - !b.data;
});
console.log(array);.as-console-wrapper { max-height: 100% !important; top: 0; }Another version with stress on the key could be the check for existence.
var array = [{ ID: 1, Name: 'one', data: {} }, { ID: 2, Name: 'two' }, { ID: 3, Name: 'three', data: {} }, { ID: 4, Name: 'four' }, { ID: 5, Name: 'five', data: {} }];
array.sort(function (a, b) {
return ('data' in b) - ('data' in a);
});
console.log(array);.as-console-wrapper { max-height: 100% !important; top: 0; }
ID for sorting within the have data and not have data groups. In other words, you rely on the input array already being sorted by ID in order for your data/non-data groups to be sorted by ID.
It is not clear from the question if the only thing that matters in the desired sort is the presence or absence of the data property. The desired "final sort result" shows the data sorted first by the presence or absence of data, but then in ascending order of ID within those groups. It is possible that sorting by ID is merely an artifact of the starting array order and is not a required part of the question. On the other hand, it may be that sorting by both data and then ID are both required.
The other solutions either do not sort at all based on the ID (Nina Scholz's answer), or sort by both data and ID, but do so erroneously depending on the input array (Rajesh's answer). Both rely on the order of the input array to provide the desired result array.
The following code will sort the array based first on the presence or absence of data and then by ID within those two sub groups.
Sorting the originally provided input array:
var array = [{ ID: 1, Name: 'one', data: {} }, { ID: 2, Name: 'two' }, { ID: 3, Name: 'three', data: {} }, { ID: 4, Name: 'four' }, { ID: 5, Name: 'five', data: {} }];
array.sort(function(a, b) {
if(a.data && !b.data) {
// a has data, b does not have data, a is first
return -1;
}
if(!a.data && b.data) {
// a does not have data, b does have data, b is first
return 1;
}
// a and b either both have data, or both don't have data. Sort the smaller ID first.
return a.ID - b.ID;
});
console.log(array)Below is the same sort starting with an input array slightly modified from the one used in Rajesh's updated answer. The array from that answer has been modified to change ID:4, to ID:41,. With that modified input array, Rajesh's sort will produce erroneous results. This code will sort it correctly by both data and ID.
var array=[{ID:1,Name:"one",data:{"more info here":"something"}},{ID:2,Name:"two"},{ID:30,Name:"Thirty",data:{"more info here":"something"}},{ID:41,Name:"four"},{ID:5,Name:"five",data:{"more info here":"something"}},{ID:40,Name:"fourty",data:{"more info here":"something"}},{ID:300,Name:"threeHundred",data:{"more info here":"something"}},{ID:20,Name:"twenty"},{ID:3e3,Name:"threeThousand",data:{"more info here":"something"}}];
array.sort(function(a, b) {
if(a.data && !b.data) {
// a has data, b does not have data, a is first
return -1;
}
if(!a.data && b.data) {
// a does not have data, b does have data, b is first
return 1;
}
// a and b either both have data, or both don't have data. Sort the smaller ID first.
return a.ID - b.ID;
});
console.log(array)
datafirst, sorted in increasingIDorder, then all those withoutdataalso sorted in increasingIDorder?datashould be before all those withoutdataand you don't care what order they are in within those two groups, then providing randomized input might not matter. In other words, if the array result is OK if theIDs are in the order[5,1,3,4,2], then this might not matter?ID(i.e. your question implies that this may be the case, but is not clear). If you clarify that you either do, or do not, care about the order ofIDwithin the havedata/not havedatasubgroups, I will remove my down vote. If you do clarify this (one way or the other), please leave a comment with@Makyenin it so I am notified to come back and take a look.