17 lines
353 B
TypeScript
17 lines
353 B
TypeScript
// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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export function replaceIndex<T>(
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arr: ReadonlyArray<T>,
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index: number,
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newItem: T
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): Array<T> {
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if (!(index in arr)) {
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throw new RangeError(`replaceIndex: ${index} out of range`);
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}
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const result = [...arr];
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result[index] = newItem;
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return result;
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}
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