What is the best de-facto standard cross-browser method to determine if a variable in JavaScript is an array or not?
Searching the web there are a number of different suggestions, some good and quite a few invalid.
For example, the following is a basic approach:
function isArray(obj) {
return (obj && obj.length);
}
However, note what happens if the array is empty, or obj actually is not an array but implements a length property, etc.
So which implementation is the best in terms of actually working, being cross-browser and still perform efficiently?