Extending RxJS custom operator without patch core library

In most cases you probably won’t need to write own operator for RxJS. Version 5 of RxJS has nearly 100 operators built in from very default operator like map to complex one like mergeScan supports various use cases. If you came to feel to write custom operator lot of cases it could be resolved by simple combination of existing operators. But still, there are some edge cases default operators can’t cover and require to write complete new operator. ... Read more