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So we learned these basics about classes,

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let me come back to that class field

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versus property thing

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because it is important to get that right.

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If you have a class that looks like this,

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then this here would be called a class field,

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this here when you will use it in the constructor would be called a class property right away,

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so title is a class property, category is a class field but it's important to know that in the end, this

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is just a theoretical separation,

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a field becomes a property,

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when we create an object based on the class, we just call it property in the constructor function right

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away because the constructor gets called during that object creation process

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so there we get a property right away.

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You don't really have to memorize this difference though, in the end fields are like properties, we define

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them in a class so that we have a property when we create that object based on the class.

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The thing here at the bottom print info by the way would still be called a class method or an object

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method. In our code here, the implication is that all these things here in the constructor function are

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properties, of course I got fields of the same name which is no problem because these would be created

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as properties when we instantiate the product,

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now we basically overwrite everything we set up there in the constructor and therefore you can actually

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remove that.

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This definition here is not required to be able to assign values, in the constructor you can add properties

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for the first time,

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so without having defined fields for them before just like that with the this keyword and indeed it

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makes no sense or it rarely makes sense to define fields here

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if you're assigning a value to them in the constructor right away anyways because then you just basically

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overwrite that default logic where every field would be translated to a property because you manually

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assign a value to that property and therefore add that property anyways in the constructor.

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So this can be removed here,

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it's just something which will become important later again where we also work with fields which we

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don't initialize in the constructor. For now

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that's not the case,

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so our object can just look like this, our class can just look like this for the moment.