Re: When to use .new?

On 12/5/22 11:19, Ralph Mellor wrote:
> I forgot to mention one other shortcut that is always available
> if you do have to use `.new` (which is the case for most types).
> 
> You can write:
> ```
> my $foo = 42;
> ```
> The `42` on the RHS of the `=` is the shortest way to create
> an integer value corresponding to `42`.
> 
> But you could also write:
> ```
> my $foo = Int.new: 42;
> ```
> It's odd, but you could that. You could also write:
> 
> ```
> my Int $foo .= new: 42;
> ```
> Note the `.=` instead of `=` and the `new` instead of `Int.new`.
> 
> That is, if you constrain a variable's type, and want to initialize
> that variable to a value of exactly that type, you don't have to
> repeat the type name on the RHS of the `=` if you write it as above.
> 
> For types that have literal forms it's not helpful. And for short type
> names it's helpful, but only a little. But let's say you really wanted
> to write out the full `NativeCall::Types::Pointer` and you wanted a
> variable constrained to that type and initialized to have a value of
> that type. Now it's a big deal:
> 
> ```
> my NativeCall::Types::Pointer $foo .= new: 42;
> ```
> 
> --
> raiph

Hi Ralph,

Thank you for the excellent explanation!

Is there a list of what variables/object
I have to use .new with and which ones I
don't?

-T

• When to use .new? by ToddAndMargo via perl6-users
• Re: When to use .new? by Ralph Mellor
• Re: When to use .new? by Ralph Mellor
• Re: When to use .new? by ToddAndMargo via perl6-users