Combine json arrays by key, javascript
I need to combine two json arrays, delivered by two rest services. The entries with the same "id" belong together.
json1 = [{id:1,name:'aaa'},
{id:5,name:'ccc'},
{id:3,name:'bbb'}
];
json2 = [{id:3,parameter1:'x', parameter2:'y', parameter3:'z'},
{id:1,parameter1:'u', parameter2:'v', parameter3:'w'},
{id:5,parameter1:'q', parameter2:'w', parameter3:'e'}
];
I need a combined/copied/cloned json array in javascript in the following way (my model in angular2):
json3 = [{id:3,name:'bbb',parameter1:'x', parameter2:'y', parameter3:'z'},
{id:1,name:'aaa', parameter1:'u', parameter2:'v', parameter3:'w'},
{id:5,name:'ccc', parameter1:'q', parameter2:'w', parameter3:'e'}
];
Is there a way to combine them? The parameter names are not defined exactly and it needs to work with variable parameter vectors.
I tried it with mixed for each loops. Seems to me very ugly.
Solution 1:
Two one-liners:
with lodash:
res = _(json1).concat(json2).groupBy('id').map(_.spread(_.assign)).value();
in ES2015:
res = json2.map(x => Object.assign(x, json1.find(y => y.id == x.id)));
Solution 2:
ES2015 georg's answer works great;
json1 = [
{id:1, test: 0},
{id:2, test: 0},
{id:3, test: 0},
{id:4, test: 0},
{id:5, test: 0}
];
json2 = [
{id:1, test: 1},
{id:3, test: 1},
{id:5, test: 1}
];
json1.map(x => Object.assign(x, json2.find(y => y.id == x.id)));
result:
{id:1, test: 1},
{id:2, test: 0},
{id:3, test: 1},
{id:4, test: 0},
{id:5, test: 1}