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'use strict';
const internals = {};
module.exports = function (array1, array2, options = {}) {
if (!array1 ||
!array2) {
return (options.first ? null : []);
}
const common = [];
const hash = (Array.isArray(array1) ? new Set(array1) : array1);
const found = new Set();
for (const value of array2) {
if (internals.has(hash, value) &&
!found.has(value)) {
if (options.first) {
return value;
}
common.push(value);
found.add(value);
}
}
return (options.first ? null : common);
};
internals.has = function (ref, key) {
if (typeof ref.has === 'function') {
return ref.has(key);
}
return ref[key] !== undefined;
};