RxJS – Multiple sources for .withLatestFrom

withLatestFrom supports multiple observables:

.withLatestFrom(source1, source2, source3)
.map((data) => { console.log(data) });

-> [val, value1, value2, value3]

It also supports function as it’s last parameter, so you can get values other than arrays:

observable$
    .withLatestFrom(source1, source2, (val, one, two) => {
        return {val: val, one: one, two: two};
     });