BSON::Javascript

Container for Javascript code.

Description

Javascript can be run on a mongodb server so there is a type for it. This class acts as a container for Javascript. There are two ways to specify this; Javascript with or without a scope. The scope variant is deprecated in the mean time in the BSON specification but still implemented in this code. Better not to use it however.

Examples of the use of Javascript is found here. The operation explained here is about the mapReduce run command.

Be aware that, according to this story, that using an aggregation pipeline provides better performance in some cases. This link provides also a few examples of the mapReduce operation. That said, and the notion that mapReduce can also accept javascript in just a string nowadays, this class is of less importance.

Synopsis

Declaration

unit class BSON::Javascript:auth<github:MARTIMM>;

Example

my BSON::Document $d .= new;
$d<javascript> = BSON::Javascript.new(
  :javascript('function(x){return x;}')
);

Methods

new

Create a Javascript object

new ( Str :$javascript, BSON::Document :$scope? )

• Str :$javascript; the javascript code

• BSON::Document :$scope; Optional scope to provide variables

Show the structure of a document

method raku ( Int :$indent --> Str ) is also<perl>

encode

Encode a BSON::Javascript object. This is called from the BSON::Document encode method.

method encode ( --> Buf )

decode

Decode a Buf object. This is called from the BSON::Document decode method.

method decode (
  Buf:D $b, Int:D $index is copy, Buf :$scope, :$decoder
  --> BSON::Javascript
)

• Buf $b; the binary data

• Int $index; index into a larger document where binary starts

• Buf $scope; Optional scope to decode

• BSON::Decode $decoder; A decoder for the scope to decode.