# toMap

Converts the observable sequence to a Map if it exists. Note that this only works in an ES6 environment or polyfilled.

## Arguments

1. `keySelector` *(`Function`)*: A function which produces the key for the Map.
2. `[elementSelector]` *(`Function`)*: An optional function which produces the element for the Map. If not present, defaults to the value from the observable sequence.

## Returns

*(`Observable`)*: An observable sequence with a single value of a Map containing the values from the observable sequence.

## Example