如何查找对象是否包含JavaScript中的数组？

Question

I have a huge set of data which is basically an array of objects. I need to loop through all the objects to see if any contain any array themselves.

Thoughts ?

Answer 1

Try this:

for (var i = 0; i < arr.length; i++) {
    var obj = arr[i];

    for (var j in obj) {
        if (!obj.hasOwnProperty(j)) {
            continue;
        }

        if (obj[j] instanceof Array) {
            console.log(i + '.' + j + ' is array');
        }
    }
}

Answer 2

You can use filter to grab only objects that match a condition and then check if any of the values is an array with some .

Example:

var arr = [
  { x: 1 },
  { x: 2, a: [] },
  { x: 3, a: [] },
  { x: 1 },
];

arr.filter(a => Object.values(a).some(o => o instanceof Array))