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33 lines
765 B
33 lines
765 B
/**
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* @hidden
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*/
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export interface CollectionLike<T> {
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// tslint:disable-next-line completed-docs
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has(item: T): boolean;
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}
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/**
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* Retrieve the missing values in a collection based on an array of items.
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*
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* @hidden
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* @param source Source collection to search through.
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* @param items Items to search for.
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* @param maxValues Maximum number of values after the search process is stopped. (Default: 5)
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*/
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export default <T>(source: CollectionLike<T>, items: T[], maxValues = 5) => {
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const missingValues: T[] = [];
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for (const value of items) {
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if (source.has(value)) {
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continue;
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}
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missingValues.push(value);
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if (missingValues.length === maxValues) {
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return missingValues;
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}
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}
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return missingValues.length === 0 ? true : missingValues;
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};
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