I don't know why, but sorting is one of the things by programming that confuses me every time...
I want to sort the array members on the first level so, that all members with the properties licence: "truck" and active: true are at first in the list. Then the next members should be all members with licence: "car" and active: true
underscore.js is avaiable...
[
{
name: 'Denes',
properties: [
{
licence: "car",
active: true
},
{
licence: "truck",
active: false
},
]
},
{
name: 'Patrick',
properties: [
{
licence: "car",
active: false
},
{
licence: "truck",
active: true
},
]
},
{
name: 'Marc',
properties: [
{
licence: "car",
active: false
},
{
licence: "truck",
active: false
},
]
}
]
Expected result:
[
{
name: 'Patrick',
properties: [
{
licence: "car",
active: false
},
{
licence: "truck",
active: true
},
]
},
{
name: 'Denes',
properties: [
{
licence: "car",
active: true
},
{
licence: "truck",
active: false
},
]
},
{
name: 'Marc',
properties: [
{
licence: "car",
active: false
},
{
licence: "truck",
active: false
},
]
}
]
A compound key for this sort would be the sum of active properties with respect to the sort order + the name, in case there are many people with equal properties. That gives:
sortOrder = {'truck':1 , 'car': 2}
result = _.sortBy(data, item => [
_(item.properties)
.filter(prop => prop.active)
.map(prop => sortOrder[prop.licence])
.sum()
,
item.name]
).reverse();
Array#sort
and a function for a sort priority would help.
var arr = [{ name: 'Denes', properties: [{ licence: "car", active: true }, { licence: "truck", active: false }, ] }, { name: 'Patrick', properties: [{ licence: "car", active: false }, { licence: "truck", active: true }, ] }, { name: 'Marc', properties: [{ licence: "car", active: false }, { licence: "truck", active: false }, ] }]; arr.sort(function (a, b) { function max(r, a) { return Math.max(r, ({ truck: 2, car: 1 }[a.licence] || 0) + ({ true: 8, false: 4 }[a.active] || 0)); } return b.properties.reduce(max, 0) - a.properties.reduce(max, 0); }) console.log(arr);
Try this:
function comparator(){
return function(a, b){
return weightage(b)- weightage(a);
}
};
function weightage(obj){
var maxWeight = -1;
for (var i in obj.properties){
if(obj.properties[i].licence == 'truck' && obj.properties[i].active) {
maxWeight = 1;
return maxWeight;
} else if (obj.properties[i].licence == 'car' && obj.properties[i].active) {
maxWeight = 0;
}
}
return maxWeight;
};
assuming your array is named: arr
call arr.sort(comparator())
. Hope this solves your query.. :)
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