feat(throwIfEmpty): adds throwIfEmpty operator #3368
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Having this operator basically means that
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This is a new, simple, operator that will emit an error if the source observable completes without emitting a value. This primitive operator can be used to compose other operators such as `first` and `last`, and is a good compliment for `defaultIfEmpty`.
benlesh
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jasonaden
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Mar 7, 2018
| * | ||
| * @example | ||
| * | ||
| * const click$ = fromEvent(button, 'clicks'); |
jayphelps
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Mar 7, 2018
| */ | ||
| export const throwIfEmpty = | ||
| <T>(errorFactory: (() => any) = defaultErrorFactory) => tap<T>({ | ||
| hasValue: false, |
IgorMinar
approved these changes
Mar 8, 2018
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This is a new, simple, operator that will emit an error if the source observable completes without emitting a value. This primitive operator can be used to compose other operators such as
firstandlast, and is a good compliment fordefaultIfEmpty.This is a step toward refactoring a few other operators to be smaller.