How to interpret a data structure in matlab constructor function?

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MatLab

Could you please explain me the Matlab code below? What is the reason of using the Structure in Constructor function?
Why there is a if-else check for StructParameters.noInput? What is the purpose this?

Many thanks!!!

classdef myClass
    properties
        a;
        d;
        noInput;
    end
    methods
        function obj=myClass(StructParameters)
            if nargin==0
                StructParameters.noInput=1;
            else
                StructParameters.noInput=0;
            end
           
            if ~isstruct(StructParameters)
                error('Input argument has to be struct.')
            else
                % load the parameters
                F=fields(StructParameters);
                for x=1:length(F)
                    obj.(F{x})=StructParameters.(F{x});
                end
            end
                    
            if ~isfield(StructParameters, 'a')
                obj.a=[1 2; 4 5];
            end
   
           if ~isfield(StructParameters, 'd')
                obj.d=[0 1; 4 5];
            end
        end
       
     end
   
end

What I have tried:

Made a search through Google and some other Forums but still in difficulties understanding the usage of Structure in Constructor function.