Inside the module what is the different of 'public class' vs 'public type' ?

[ajismyid]

Q: Inside the module, what is the different between 'public class' vs 'public type' ?
Especially the way we syntax it properly when we want to initiate object after import it to the main.mo

For example,
inside 'Buffer' module :

public class Buffer(initCapacity : Nat) {
var count : Nat = 0;
var elems : [var X] = [var];

compare to:
inside 'List' module :

public type List = ?(T, List);

[saikatdas0790]

Type is just that, a type declaration.
class is a way for you to declare the structure of your object, and then you can instantiate as many instances of that class as you need

[ajismyid]

Can module "type" contain functions/methods like "class" inside it?

[professionalGithub99]

Basically yes

[ajismyid]

On what kind of scenario should we use "type" vs "class" for constructing objects?

[paulyoung]

If you use type you’re describing something at the type level and (almost always) can’t use it to create something at the value level.

The exception is variants because the type definition includes type constructors that can be used to create values of that type.

Coincidentally, in my talk on variants I demonstrated how the class keyword is just syntactic sugar for defining a type and a value with the same name.

For example:

public class Foo() {
  public let value : Nat = 0;
};

Is convenience for:

public type Foo = {
  value : Nat;
};

public let Foo = func () : Foo {
  return {
    value = 0;
  };
};