hckrnews / arrays

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

    const jsonValue = toJson(array);

    const arrayLength = array.length;

    return original.filter((value) => {

        const valueToJson = JSON.stringify(value);

        if (multi) {

            const found = jsonValue.reduce((accumulator, currentValue) => {

                if (currentValue.includes(valueToJson)) {

                    return accumulator + 1;

                }

                return accumulator;

            }, 0);

            return found === arrayLength;

        }

        return jsonValue.includes(valueToJson);

    });

}