判定偶数
function collect_all_even(collection) { return collection.filter(item => item%2 == 0); }
两个集合的交集
return collection_a.filter(item_a => collection_b.some(item_b => item_a == item_b ) );
判定偶数
function collect_all_even(collection) { return collection.filter(item => item%2 == 0); }
两个集合的交集
return collection_a.filter(item_a => collection_b.some(item_b => item_a == item_b ) );