Reading array elements

[izveigor]

Is your feature request related to a problem or challenge?

Any element of the array must be read. There are two ways to take elements from an array: through functions and through indices.
Functions:
Let's introduce two functions for reading one element and element range:

• array_element(array, i) (read one element);
• array_slice(array, i, j) (read element range);

Index improvements:

• additional key for slices (array[i:j]);
• multiple index support (array[0][0][0][0])
• negative indices (single: array[-1])
• negative indices (multiple: array[-1:-2]);
• support for names indexes (single: array[a]);
• support for names indexes (multiple: array[a:b])
• arithmetic operations within an index (single: array[1 + 2:])
• arithmetic operations within an index (multiple: array[1 + 2:3 + 4])

Describe the solution you'd like

No response

Describe alternatives you've considered

No response

Additional context

No response