at method

E? at(int index)

The at() method is equivalent to the bracket notation when index is non-negative. For example, array0 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.

The usual practice is to access length and calculate the index from that — for example, arrayarray.length - 1. The at() method allows relative indexing, so this can be shortened to array.at(-1).

The at() method is generic. It only expects the this value to have a length property and integer-keyed properties.

Implementation

E? at(int index) => jsu.callMethod(this, 'at', [index]);