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Reading array elements #6935

@izveigor

Description

@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])

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