48 lines
1.2 KiB
TypeScript
48 lines
1.2 KiB
TypeScript
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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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const normalizedIndex =
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typeof idOrIndex === "string"
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? values.findIndex((value) => value.id === idOrIndex)
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: idOrIndex >= 0
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? idOrIndex
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: values.length + idOrIndex;
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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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