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export interface JoinResult<T> {

left?: T;

right?: T;

}

export function joinOnProperty<TItem, TKey>(

left: TItem[],

right: TItem[],

propertySelector: (item: TItem) => TKey,

): Array<JoinResult<TItem>> {

const map = new Map<TKey, JoinResult<TItem>>();

for (const item of left) {

map.set(propertySelector(item), { left: item });

}

for (const item of right) {

const key = propertySelector(item);

const entry = map.get(key);

if (entry) {

entry.right = item;

} else {

map.set(key, { right: item });

}

return [...map.values()];

}