first
function first<T, D>(predicate: BooleanConstructor, defaultValue: D): OperatorFunction<T, TruthyTypesOf<T> | D>;
function first<T, S extends T>(predicate: (
value: T,
index: number,
source: Observable<T>,
) => value is S, defaultValue?: S): OperatorFunction<T, S>;function first<T, S extends T, D>(predicate: (
value: T,
index: number,
source: Observable<T>,
) => value is S, defaultValue: D): OperatorFunction<T, S | D>;function first<T, D = T>(predicate: (
value: T,
index: number,
source: Observable<T>,
) => boolean, defaultValue?: D): OperatorFunction<T, T | D>;§
first<T, D>(predicate: BooleanConstructor, defaultValue: D): OperatorFunction<T, TruthyTypesOf<T> | D>
[src]§Return Type
§
OperatorFunction<T, TruthyTypesOf<T> | D>
[src]§
first<T, S extends T>(predicate: (value: T, index: number, source: Observable<T>) => value is S, defaultValue?: S): OperatorFunction<T, S>
[src]§Parameters
§
predicate: (value: T, index: number, source: Observable<T>) => value is S
[src]§Return Type
§
OperatorFunction<T, S>
[src]§
first<T, S extends T, D>(predicate: (value: T, index: number, source: Observable<T>) => value is S, defaultValue: D): OperatorFunction<T, S | D>
[src]§Parameters
§
predicate: (value: T, index: number, source: Observable<T>) => value is S
[src]§Return Type
§
OperatorFunction<T, S | D>
[src]§
first<T, D = T>(predicate: (value: T, index: number, source: Observable<T>) => boolean, defaultValue?: D): OperatorFunction<T, T | D>
[src]§Parameters
§
predicate: (value: T, index: number, source: Observable<T>) => boolean
[src]§Return Type
§
OperatorFunction<T, T | D>
[src]