nixir

# Test selection with 'or' default

let

  attrs = {

    a = 1;

    b = 2;

  };

in {

  # Attribute exists - should use value from attrs

  has_attr = attrs.a or 999;

  # Attribute doesn't exist - should use default

  missing_attr = attrs.c or 100;

  # Nested default expression

  nested = attrs.d or (attrs.a + attrs.b);

  # Default with literal

  with_string = attrs.name or "default_name";

}