Question

I have an object like this:

ricHistory = {
  name1: [{
    test1: value1,
    test2: value2,
    test3: value3
  }],
  name2: [{
    test1: value1,
    test2: value2,
    test3: value3
  }]
};

Now I want to check if e.g. name2 is empty with Javascript/jQuery. I know the method hasOwnProperty. It work for data.hasOwnProperty('name2') only if the name exists or not, but I have to check if its empty.

Answer 1

Try this:

if (ricHistory.name2 && 
    ricHistory.name2 instanceof Array &&
    !ricHistory.name2.length) {
   console.log('name2 is empty array');
} else {
   console.log('name2 does not exists or is not an empty array.');
}

The solution above will show you whether richHistory.name2 exists, is an array and it’s not empty.