53 lines
1.4 KiB
TypeScript
53 lines
1.4 KiB
TypeScript
// Copyright: Ankitects Pty Ltd and contributors
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// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
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export interface Identifiable {
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id?: string;
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}
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function normalize<T extends Identifiable>(
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values: T[],
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idOrIndex: string | number
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): number {
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let normalizedIndex: number;
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if (typeof idOrIndex === "string") {
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normalizedIndex = values.findIndex((value) => value.id === idOrIndex);
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} else if (idOrIndex < 0) {
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normalizedIndex = values.length + idOrIndex;
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} else {
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normalizedIndex = idOrIndex;
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}
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return normalizedIndex >= values.length ? -1 : normalizedIndex;
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}
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export function search<T extends Identifiable>(
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values: T[],
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idOrIndex: string | number
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): T | null {
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const index = normalize(values, idOrIndex);
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return index >= 0 ? values[index] : null;
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}
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export function insert<T extends Identifiable>(
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values: T[],
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value: T,
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idOrIndex: string | number
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): T[] {
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const index = normalize(values, idOrIndex);
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return index >= 0
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? [...values.slice(0, index), value, ...values.slice(index)]
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: values;
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}
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export function add<T extends Identifiable>(
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values: T[],
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value: T,
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idOrIndex: string | number
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): T[] {
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const index = normalize(values, idOrIndex);
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return index >= 0
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? [...values.slice(0, index + 1), value, ...values.slice(index + 1)]
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: values;
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}
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