Fuzion • Tutorial • Empty Constructors

Empty Constructors

In Fuzion, it is fairly common to declare constructor fields that do not contain any code or inner declarations, such as the feature person in this example:

example is
{

  person(name String, age i32) is
  {
    # empty code block
  }

  p := person("Methuselah", 969);
  say("{p.name}, {p.age}yo");
}

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example is
{
  person(name String, age i32) is
  {
    # empty code block
  }
  p := person("Methuselah", 969);
  say("{p.name}, {p.age}yo");
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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What are effects?

If a constructor feature contains inner declarations is is required:

example is
{

  person(name String, age i32) is
  {
    show =>
    {
      say("$name, {age}yo");
    }
  }

  p := person("Methuselah", 969);
  p.show();
}

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example is
{
  person(name String, age i32) is
  {
    show =>
    {
      say("$name, {age}yo");
    }
  }
  p := person("Methuselah", 969);
  p.show();
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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What are effects?

last changed: 2025-04-11

next: Assignments