How to check if an array is empty or exists with JavaScript?

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To check if an array is empty or exists with JavaScript, we use the Array.isArray method and the array’s length property.

For instance, we write

if (Array.isArray(array) && array.length) {
  // ...
}

to check if array is an array with Array.isArray.

And then we use array.length to check if it’s bigger than 0 to check if it’s filled with content.

By John Au-Yeung