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Making an Asynchronous call inside a for loop in Angular 2 ------------------------------------------------------------------------ One of the frustrating problems of Angular 2, is that when you call an asynchronous method inside a for loop. It happens that, before the call returns for 1st iteration, the second iteration is called and this messes up the value of variables. Solution: One should use the flatMap here, to make sure that call from 2nd iteration does not happen unless call returns and completes for the 1st iteration. Observable . of ( localListID ). flatMap (( ellistId ) => ellistId ). subscribe (( pData ) => { //Make asynchronous call here, using pData. } Here localListID is array, and we want to use elements of this array to make asynchronous calls.