对象搜索算法挑战

function where(collection, source) {
    var arr = [];
     // What's in a name?
   
    for (var index = 0; index < collection.length; index++) {
        for (var key in collection[index]) {
            var count = 0;
            for (var key2 in source) {
                if (collection[index].hasOwnProperty(key2)) {
                    if (source[key2] == collection[index][key2]) {
                        count++;
                    }
                    if (count == Object.getOwnPropertyNames(source).length && key == key2) {
                        arr.push(collection[index]);
                    }
                }
            }
        }

    }
    return arr;
}

where([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" });


参考https://segmentfault.com/a/1190000010866742