Array.prototype.at()

The at() method of Array instances takes an integer value and returns the item at that index, allowing for positive and negative integers. Negative integers count back from the last item in the array.

The at() method is equivalent to the bracket notation when index is a non-negative integer. For example, array[0] and array.at(0) both return the first item. However, when counting elements from the end of the array, you cannot use array[-1] like you may in Python or R, because all values inside the square brackets are treated literally as string properties, so you will end up reading array[“-1”], which is just a normal string property instead of an array index.

Syntax example: at(index)