check iterative if it is a nested structure in matlab

main.m
s.outer_field.inner_field = true;
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main.m
function is_nested = isNestedStructure(s)
% ISNESTEDSTRUCTURE Check if the input is a nested structure
%   Returns true if the input structure has fields that are themselves structures

% Initialize the output variable to false
is_nested = false;

% Loop over the fields of the input structure
fields = fieldnames(s);
for i = 1:numel(fields)
    field_value = s.(fields{i});
    if isstruct(field_value)
        % The field is a structure, set the output variable to true and exit the function
        is_nested = true;
        return
    end
end
end
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main.m
% Create a non-nested structure
s1.field1 = 1;
s1.field2 = 'hello';

% Check if s1 is a nested structure
is_nested1 = isNestedStructure(s1);

% Create a nested structure
s2.field1.subfield1 = 1;
s2.field1.subfield2 = 2;
s2.field2 = 'world';

% Check if s2 is a nested structure
is_nested2 = isNestedStructure(s2);
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