Try the following testGame.m to see how to use object-oriented programming in Matlab. You'll need to define classes via classdef function. This link is helpful too: https://www.mathworks.com/help/matlab/matlab_oop/create-a-simple-class.html
Since most avatars have 2 hands, you'll need a separate function to decide what to do when you try to equip more items than the avatar can handle. Ex: equipping 2-hand sword + 1-hand shield shouldn't be allowed. You'll have to unequip the other hand, etc. This, I leave up the the game developer.
%testGame.m
P1 = Player('player1'); %Create new player of lv1 named player1
NewItem = Weapon('Sword Of Matlab', 10000, '2-hand'); %Make new item
P1.wear(NewItem); %Equip player with new item
NewItem = Armor('Shield of Functions', 10000, '1-hand'); %Make new item
P1.wear(NewItem); %Equip player with new item
P1.levelUp %Level up the player
P1.Level
% 2
P1.Armor
% Armor with properties:
% Name: 'Shield of Functions'
% ArmorPt: 10000
% Type: '1-hand'
P1.Weapon
% Weapon with properties:
% Name: 'Sword Of Matlab'
% Damage: 10000
% Type: '2-hand'
