Final answer:
To access a specific element in an array or list, use square brackets [] with the index number.
Step-by-step explanation:
Expression for the current element ids?
To clarify, if you are working with a list or array of elements in a programming language such as Python or JavaScript, and you want to access a specific element by its index, you would use square brackets [ ] with the index number. For example, if you have a list named 'ids' and you want to access the third element, the expression would be
ids[2]
(assuming the index starts at 0). If you have more complex data structures like nested lists or dictionaries, you can also use dot notation or multiple square brackets to access elements in the structure.