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https://github.com/vector-im/element-call.git
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0f5dc33918
This probably should have been part of https://github.com/element-hq/element-call/pull/2984
37 lines
1.1 KiB
TypeScript
37 lines
1.1 KiB
TypeScript
/*
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Copyright 2024 New Vector Ltd.
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SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
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Please see LICENSE in the repository root for full details.
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*/
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/**
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* Fills in the 'undefined' gaps in a collection by drawing items from a second
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* collection, or simply filtering out the gap if no items are left. If filler
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* items remain at the end, they will be appended to the resulting collection.
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*/
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export function fillGaps<A>(
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gappy: Iterable<A | undefined>,
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filler: Iterable<A>,
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): Iterable<A> {
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return {
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[Symbol.iterator](): Iterator<A> {
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const gappyIter = gappy[Symbol.iterator]();
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const fillerIter = filler[Symbol.iterator]();
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return {
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next(): IteratorResult<A> {
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let gappyItem: IteratorResult<A | undefined>;
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do {
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gappyItem = gappyIter.next();
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if (!gappyItem.done && gappyItem.value !== undefined)
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return gappyItem as IteratorYieldResult<A>;
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const fillerItem = fillerIter.next();
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if (!fillerItem.done) return fillerItem;
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} while (!gappyItem.done);
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return gappyItem;
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},
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};
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},
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};
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}
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