How can I join two objects in Angular?

Question

how to join to object in angular 2?

object response 1

0:Object
1:Object
2:Object
3:Object

object response 2

0:Object
1:Object
2:Object
3:Object

myComponent component

resultdata :any=Array;

 fooddrinks_data_func(Defaultparams){

    return this.CitiesService.getresult(Defaultparams).subscribe(data => {                
         this.resultdata = this.resultdata.join(data.categorylistvalues);

    });  
}

I get this error.

error_handler.js:59 ORIGINAL STACKTRACE: ErrorHandler.handleError @ error_handler.js:59 next @ application_ref.js:348 schedulerFn @ async.js:93 SafeSubscriber.__tryOrUnsub @ Subscriber.js:234 SafeSubscriber.next @ Subscriber.js:183 Subscriber._next @ Subscriber.js:125 Subscriber.next @ Subscriber.js:89 Subject.next @ Subject.js:55 EventEmitter.emit @ async.js:79 NgZone.triggerError @ ng_zone.js:333 onHandleError @ ng_zone.js:294 webpackJsonp.1416.ZoneDelegate.handleError @ zone.js:338 webpackJsonp.1416.Zone.runTask @ zone.js:169 ZoneTask.invoke @ zone.js:420 error_handler.js:60 TypeError: _this.resultdata.join is not a function

the Final result should be like this.

this.resultdata

0:Object
1:Object
2:Object
3:Object
4:Object
5:Object
6:Object
7:Object

Answer 1

I think you are looking for object.assign()?

The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It will return the target object.

var obj1 = { a: 1 };
var obj2 = { b: 2 };

var merged = Object.assign(obj1, obj2);

console.log(merged); // { a: 1, b: 2 }