Evaluates obj to determine if it's an array, an array-like collection, or something else. This is useful when working with the function arguments collection, NodeLists and HTMLElement collections.

Note: This implementation doesn't consider elements that are also collections, such as <form> and <select>, to be array-like.

$ component install timoxley/is-collection

isCollection(document.querySelectorAll('div')) // => truthy (2)
isCollection([]) // => truthy (1)

function() {
  return isCollection(arguments)
}() // => truthy (2)

Takes an object and returns a number indicating the results of the test:

• 0: Neither an array nor an array-like collection.
• 1: Real array.
• 2: Array-like collection.

Original code adapted from YUI.

BSD