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showing results for - "js json groupby prop"
Felix
23 Sep 2019
1function groupArrayOfObjects(list, key) {
2  return list.reduce(function(rv, x) {
3    (rv[x[key]] = rv[x[key]] || []).push(x);
4    return rv;
5  }, {});
6};
7
8var people = [
9    {sex:"Male", name:"Jeff"},
10    {sex:"Female", name:"Megan"},
11    {sex:"Male", name:"Taylor"},
12    {sex:"Female", name:"Madison"}
13];
14var groupedPeople=groupArrayOfObjects(people,"sex");
15console.log(groupedPeople.Male);//will be the Males 
16console.log(groupedPeople.Female);//will be the Females
Finn
09 Jun 2019
1var myJsonFromSQL = [{id:1, cat:'test1'},{id:2, cat:'test1'},
2                     {id:3, cat:'test2'},{id:4, cat:'test2'}];
3
4// 1 LINE CODE:
5//'Set' deletes/do not consider duplicates
6const arr_cat =  [...new Set(myJsonFromSQL.map(i => i.cat))];
7//RESULT:
8You will get an array with the property values grouped:
9arr_cat   ['test1','test2']
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