Object representation in Scratch

scratchtomv

In Scratch, the basic way of storing data is by using variables, which can contain one information at a time. But how to store multiple pieces of information related to one object?

Let’s take the example of a dog : we need dog objects with multiple information related to it, like his name, his age, his race, his owner, etc.
Would look like this in C# :

It can also be represented as a table :

This simple scratch function create a dog (works for any kind of objects) :

define Add dog (name, age, race, owner)
    add (name) to [my dogs v]
    add (age) to [my dogs v]
    add (race) to [my dogs v]
    add (owner) to [my dogs v]

…And is used like that

The object data can be accessed with two methods :
This is the fastest way, but you need to increment the dog index by 4 when looping through the list of dogs :

(item ((put your dog index here) + (put your data index here)) of [my dogs v])

This way is a bit slower and uses one more block, but is more straightforward :

(item (((put your dog index here) * (4)) + (put your data index here)) of [my dogs v])

This example accesses the age of the dog #0, and returns the second item for this dog, in this case 4 :

(item ((0) + (2)) of [my dogs v])