@effect-ts/system
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Effect-TS is a zero dependency set of libraries to write highly productive, purely functional TypeScript at scale.
42 lines (39 loc) • 1.31 kB
JavaScript
// ets_tracing: off
import * as CK from "../../../../Collections/Immutable/Chunk/index.mjs";
import * as RB from "../../../../Support/RingBufferNew/index.mjs";
import * as CH from "../../Channel/index.mjs";
import * as C from "../core.mjs";
import * as Chain from "./chain.mjs";
import * as SucceedWith from "./succeedWith.mjs";
/**
* Drops the last specified number of elements from this stream.
*
* @note This combinator keeps `n` elements in memory. Be careful with big numbers.
*/
export function dropRight_(self, n) {
if (n <= 0) {
return new C.Stream(self.channel);
}
return Chain.chain_(SucceedWith.succeedWith(() => new RB.RingBufferNew(n)), queue => {
const reader = CH.readWith(in_ => {
const outs = CK.collect_(in_, elem => {
const head = queue.head();
queue.put(elem);
return head;
});
return CH.zipRight_(CH.write(outs), reader);
}, _ => CH.fail(_), _ => CH.unit);
return new C.Stream(self.channel[">>>"](reader));
});
}
/**
* Drops the last specified number of elements from this stream.
*
* @note This combinator keeps `n` elements in memory. Be careful with big numbers.
*
* @ets_data_first dropRight_
*/
export function dropRight(n) {
return self => dropRight_(self, n);
}
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