for | forIn

for

Concatenates the observable sequences or Promises obtained by running the specified result selector for each element in source. There is an alias for this method called forIn for browsers <IE9

Arguments

1. sources (Array): An array of values to turn into an observable sequence.

2. resultSelector (Function): A function to apply to each item in the sources array to turn it into an observable sequence. The resultSelector is called with the following information: 1. the value of the element 2. the index of the element 3. the Observable object being subscribed

3. [thisArg] (Any): Object to use as this when executing resultSelector.

Returns

(Observable): An observable sequence from the concatenated observable sequences or Promises.

Example