I have array object, but i want to create its array: Object format like as:
[
{"name":"A1","type":"type1"},
{"name":"A2","type":"type1"},
{"name":"A3","type":"type1"},
{"name":"A4","type":"type1"},
{"name":"B1","type":"type2"},
{"name":"C1","type":"type3"},
{"name":"D1","type":"type4"},
{"name":"D2","type":"type4"}
]
Result format like :
["type1"=>[A1,A2,A3,A4],"type2"=>[B1],"type3"=>[C1],"type3"=>[D1,D2]]
You could iterate the array with Array#forEach and use an object with the type as keys.
var data = [{ "name": "A1", "type": "type1" }, { "name": "A2", "type": "type1" }, { "name": "A3", "type": "type1" }, { "name": "A4", "type": "type1" }, { "name": "B1", "type": "type2" }, { "name": "C1", "type": "type3" }, { "name": "D1", "type": "type4" }, { "name": "D2", "type": "type4" }],
grouped = {};
data.forEach(function (a) {
grouped[a.type] = grouped[a.type] || [];
grouped[a.type].push(a.name);
});
console.log(grouped);.as-console-wrapper { max-height: 100% !important; top: 0; }You could also do this with a reduce
.reduce((prev, cur) => {
if (prev.hasOwnProperty(cur.type))
prev[cur.type].push(cur.name);
else
prev[cur.type] = [cur.name];
return prev;
}, {});
The nice thing about this approach is there is no need for extra variables out of the scope of the reduce, it simply returns your grouped object.
see fiddle
