@johngw/stream
Version:
Reactive programming tools using the WHATWG Streams API.
26 lines • 694 B
JavaScript
import { map } from '@johngw/stream/transformers/map';
/**
* Every chunk is transformed in to an accumulator.
*
* @group Transformers
* @see {@link reduce:function}
* @example
* Accumulate all previous chunks with a counter.
* ```
* --0-------------------------1-------------------------------
*
* accumulate({ chunks: [], counter: 0 }, (acc, chunk) => ({
* chunks: [...acc.chunks, chunk],
* counter: acc.counter + 1
* }))
*
* ----{chunks:[0],counter:1}------{chunks:[0,1],counter:2}----
* ```
*/
export function accumulate(acc, fn) {
return map(async (chunk) => {
acc = await fn(acc, chunk);
return acc;
});
}
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