Rx.Observable.prototype.toMap(keySelector, [elementSelector])

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

参数

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.

返回值

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

例