More Information on Attribute Traits

[librasteve]

Some of the more recent attribute traits (is built) are not covered in the Objects tutorial. This introduces a new short section to summarize all the available attribute traits (as documented in class Attribute

See this SO question:

https://stackoverflow.com/questions/79836453/instantiating-required-attributes-without-build-submethod/79836679#79836679

[librasteve]

not sure why test is failing...

[arkiuat]

not sure why test is failing...

there's a trailing whitespace somewhere for starters. I wouldn't go digging into the other failures until that's corrected.

[coke]

Your example code fails to compile:

class Journey {
    # error if origin is not provided
    has $.origin is required;
    # reset to this default value if Nil is assigned
    has $.destination is default('Orlando') is rw;
    # private attribute
    has @!travelers;
    # is read/write
    has $.notes is rw;
    # is readonly
    has $.agent = 'Acme Travel Inc.' is readonly;
    # private attribute can (only) be set via .new
    has $!status is built;
}

The line with the problem is ‘has $.agent’, fails with Two terms in a row

[coke]

new failing code example - missing a comment before “then”. Need to predeclare Journey at the top of that block with:

=begin code :preamble<class Journey {}>

[librasteve]

@coke , @arkiuat - thank you so much for your patience with my errors here - I would never have found that missing # without your help - very embarrassing!