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18 lines
515 B
TypeScript
18 lines
515 B
TypeScript
export function same<T>(a: readonly T[] | undefined, b: readonly T[] | undefined) {
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if (a === b) return true
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if (!a || !b) return false
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if (a.length !== b.length) return false
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return a.every((x, i) => x === b[i])
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}
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export function findLast<T>(
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items: readonly T[],
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predicate: (item: T, index: number, items: readonly T[]) => boolean,
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): T | undefined {
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for (let i = items.length - 1; i >= 0; i -= 1) {
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const item = items[i]
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if (predicate(item, i, items)) return item
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}
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return undefined
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}
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