Check if array is not empty with length JavaScript

Question

I console.log(arr) it shows [] but I console.log(arr.length) it shows 0 ? It's confusing for me, so what is the best way to check if an array contain something?

Answer 1

You can check if an array is empty by checking the length property:

if (arr.length === 0) {
    // arr is empty
}

Or, to check if it contains some items:

if (arr.length) {
    // arr is not empty
}

console.log(arr) will show [] for an empty array. That's just how it shows that and a length property of 0 means that there are no items in the array.

Answer 2

This is an array: ['1','2','3','4'], so if the array is empty it will look like this: []. I would do like this:

if(arr && arr.length){ console.log('then the array is created and it has value'); }