How do you check if a variable is an array in JavaScript? [duplicate]

Answer 1

You could also use:

if (value instanceof Array) {
  alert('value is Array!');
} else {
  alert('Not an array');
}

This seems to me a pretty elegant solution, but to each his own.

Edit:

As of ES5 there is now also:

Array.isArray(value);

But this will break on older browsers, unless you are using polyfills (basically... IE8 or similar).