check if input is an empty array or empty array of arrays and save as just empty array otherwise copy the array of objects

.length Example Syntax

Const myArray = [‘Horses’, ‘Dogs’, ‘Cats’];

Using the length property, we can check the length of the array:

myArray.length

First, let's create a new array with no elements.

const arr = []

Now we can check if the array is empty by using .length.

arr.length

//To check if an array is empty using javascript
function arrayIsEmpty(array) {
    //If it's not an array, return FALSE.
    if (!Array.isArray(array)) {
        return FALSE;
    }
    //If it is an array, check its length property
    if (array.length == 0) {
        //Return TRUE if the array is empty
        return true;
    }
    //Otherwise, return FALSE.
    return false;
}

Demonstration of checking if the array is empty using Javascript

var fruitArr = new Array('Apple', 'Mango', 'Grapes');

//An example of a JavaScript array that is empty.
var arrTwo = new Array();

console.log(arrayIsEmpty(fruitArr)); //returns FALSE
console.log(arrayIsEmpty(arrTwo)); //returns TRUE

Output

FALSE
TRUE

Array.isArray([]);
Array.isArray([3]);
Array.isArray(new Array());
Array.isArray(new Array('apple', 'mango', 'grapes'));
Array.isArray(new Array(5));
Array.isArray(Array.prototype);

Array.isArray();
Array.isArray({});
Array.isArray(null);
Array.isArray(undefined);
Array.isArray(21);
Array.isArray('Random String');
Array.isArray(true);
Array.isArray(false);
Array.isArray(new Uint8Array(32));
Array.isArray({
    __proto__: Array.prototype
});