Having difficulty subscribing to multiple observables simultaneously using withLatestFrom

I am facing an issue where I have three observables and need to pass their values to a service as parameters. I attempted to do this using WithLatestFrom(), but it works fine only when all values are observables.

this.payment$.pipe(
withLatestFrom(this.first$, this.second$, this.three$)
).subscribe((v, first, second, three) => {
this.methodInfoService.fetchInfo(v, first, second, three)
})

The problem arises when the first observable is sometimes undefined, leading to the inability to subscribe to the other two observables. Can anyone suggest an alternative solution to achieve this?

Answer №1

It is important to note that when utilizing combineLatest/withLatestFrom, all observables must emit at least one value. Therefore, the approach to solving this issue depends on your specific requirements. One solution could involve setting a default value for first$ by using the following method:

withLatestFrom(this.first$.pipe(startWith('yourDefaultValue')), this.second$, this.three$)

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