The data is not inserted successfully into object

Question

The data is not inserted successfully.

Output:

dataHolder.variableNames =      []

when it should be :

dataHolder.variableNames = [{'area_12345[<>]6789'}, {'apollo123'}, {'guruX'}, {'ok'}];

% USAGE:

elementNames = {'area_12345[<>]6789', 'apollo123', 'guruX', 'ok'};
elementTypes = {'string', 'specialChar', 'int', 'float'};
elementValues = {'charlie', 'vvv', '09', '123.321'};

dataHolder = dynamicVariableNaming;

str = 'test';
result = dataHolder.ensureCellType(str);


for i = 1:3
    dataHolder.addVariables(elementNames(i), elementTypes(i), elementValues(i));
end

dataHolder.variableNames

%%% CLASS

classdef dynamicVariableNaming
%HELLO Summary of this class goes here
%   - 

   properties           
           variableNames = [];           

           variableValues = [];
           variableTypes = [];
   end

   methods (Access = public) % (Access = private)
           function obj = dynamicVariableNaming (variableName, variableValue, variableType)
           % class constructor
               if(nargin > 0)
                 obj.variableNames = variableName;                 

                 obj.variableValues = variableValue;
                 obj.variableTypes = variableType;
               end
           end  
%    end
%            
%    methods (Static = true)
           function addVariables (obj, variableName, variableValue, variableType)

                 obj.variableNames = [obj.variableNames ensureCellType(obj, variableName)];                 

                 obj.variableValues = [obj.variableValues ensureCellType(obj, variableValue)];
                 obj.variableTypes = [obj.variableTypes ensureCellType(obj, variableType)];
           end               

           function cellData = ensureCellType(obj, value)   

            if (~strcmp(class(value), 'cell')) 
                cellData = {value};
                % cell2string(value); 
            else
                cellData = value;
            end
           end            

   end   
end 

Answer 1

You are not returning the changed opbject from the addVariables method as required when you are working with non-handle objects. Remember, matlab is different in comparison with other reference passing-based languages.

To fix it either make your class enherit from the handle class, or return obj from addVariables

Cant say if there are other problems in the code due to its poor formatting and inability to run in matlab (unbalanced ends, missing constructors, etc.)