@epikodelabs/streamix

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@epikodelabs/streamix / aggregates/src/public-api / some

Function: some()

some<T>(predicate): Operator<T, boolean>

Defined in: projects/libraries/streamix/aggregates/src/lib/operators/some.ts:22

Creates a stream operator that tests if at least one value from the source stream satisfies a predicate.

This operator consumes the source stream and applies the provided predicate function to each value.

• If the predicate returns a truthy value for any element, the operator immediately emits true and then completes, effectively "short-circuiting" the evaluation.
• If the source stream completes without the predicate ever returning a truthy value, the operator emits false.

This is a "pull-based" equivalent of Array.prototype.some and is useful for validating data streams. The operator will emit only a single boolean value before it completes. Streams that never satisfy the predicate emit false (including empty sources).

Type Parameters

T

T = any

The type of the values in the source stream.

Parameters

predicate

(value, index) => MaybePromise<boolean>

The function to test each value. It receives the value and its index. It can be synchronous or asynchronous.

Returns

Operator<T, boolean>

An Operator instance that can be used in a stream's pipe method.