Simple Intersection Function in Typescript

intersection.ts

/*
 * Created by Trevor Sears <[email protected]> (https://trevorsears.com/).
 * 9:05 AM -- December 21st, 2021
 */

/**
 * Returns an array representing the intersection between all of the provided input sets.
 * 
 * @param {Iterable<T>} sets The sets for which an intersection subset should be generated.
 * @returns {T[]} An array representing the intersection between all of the provided input sets.
 */
export function intersection<T>(...sets: Iterable<T>[]): T[] {
	
	if (sets.length >= 1) {
		
		let result: T[] = [...(sets.pop() as Iterable<T>)];
		
		// De-dupe the base array.
		result = Array.from(new Set(result));
		
		for (let set of sets) {
			
			let array: T[] = Array.from(set);
			
			result = result.filter((value: T): boolean => array.includes(value));
			
		}
			
		return result;
		
	} else return [];
	
}