hckrnews / arrays

export default function intersect(original, array, multi) {

    return original.filter((value) => {

        if (multi) {

            const found = array

                .map((item) => JSON.stringify(item))

                .reduce((accumulator, currentValue) => {

                    if (currentValue.indexOf(JSON.stringify(value)) >= 0) {

                        return accumulator + 1;

                    }

                    return accumulator;

                }, 0);

            return found === array.length;

        }

        return (

            array

                .map((item) => JSON.stringify(item))

                .indexOf(JSON.stringify(value)) >= 0

        );

    });

}