rakudo v0.43.0
Dependencies
Install node 10.16.0 or 12.11.1 from https://nodejs.org
Getting started with node.js rakudo.js
The easiest way is to install the rakudo package from npm
mkdir tutorial-project # Create a fresh project directory
cd tutorial-project
npm init
npm install --save rakudo
./node_modules/.bin/perl6-js -e 'say "Hello World"'Using a node.js module
cd tutorial-project
npm install --save chalkTo use node.js modules you need to specify where they should be looked for. use lib 'nodejs#/your/path/to/node/modules' is a good way to do that
use lib 'nodejs#' ~ $*PROGRAM.parent.add('node_modules').absolute;
use chalk:from<node.js>;
say("Hello {chalk.blue("Blue")} World");Keep in mind that if you load a node.js module during precompilation it gets reloaded at runtime, so it's internal state gets lost.
Interoperability with JS
Passing :lang to eval will execute the passed code as JavaScript.
my $document = EVAL(:lang, 'return document')
You can access attributes of those objects using postcircumfix:<{ }> (you should often use the <> shorcut) You can call methods on the the objects using regular Perl 6 syntax.
$document<body>.appendChild($document.createTextNode('Hello World'));Primitive JS data types are converted rather then wrapped
| JavaScript | Perl6 |
|---|---|
| true | True |
| false | False |
| String | Str |
| null | Mu |
| undefined | Mu |
| BigInt | Int |
| Number | Num |
A Perl 6 Mu when passed to JS land ends up as null
To pass values to Perl 6 land the executed code needs a return.
EVAL(:lang<JavaScript>, '123') # This returns Mu
EVAL(:lang<JavaScript>, 'return 123') # This returns 123Extra methods on wrapped JS objects
In order to enable using wrapped objects in Perl 6 land wrapped objects offer some methods that Perl 6 expects.
sink
Does nothing.
defined
Always returns True
Bool
Always returns True
item
Returns the object it is called on
new
Uses the JavaScript new operator to create an new instance
my $Date = EVAL(:lang<JavaScript>, 'return Date'); my $instance = $Date.new('December 17, 1995 03:24:00'); say($instance.getFullYear()); # 1995
If the wrapped object has method of that same name you can use an :INTERNAL modifier to access it.
$obj.new(:INTERNAL, 123)
| -------------|-------|
This will call a js new method rather then doing new $obj(123)`
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