JavaScript

As much as we love writing Ruby, when you need to get really close to the metal, you have no choice but to use JavaScript. With this gem, Rubyists can finally harness the raw power of their machines by programming in JavaScript syntax right inside their Ruby applications.

Installation

Add this line to your application's Gemfile:

gem 'javascript'

And then execute:

$ bundle

Or install it yourself as:

$ gem install javascript

Usage

require "javascript"

puts "This is totally Ruby"

javascript {

  console.log("ZOMG JavaScript");

  let a = 1;

  console.log(a);

  a = a + 1;

  console.log(a);

  let b = function(x) {
    console.log(x + 1);
  };

  b(3);

  function c(x) {
    console.log(x + 2);
  }

  c(4);

  function inspectArguments() {
    let args = Array.prototype.join.call(arguments, ", ");
    console.log(`Arguments: ${args}`);
  }

  inspectArguments("a", "b", "c");

  inspectArguments(1, 2, 3, 4, 5);

}

puts "This is Ruby again"

Output:

% ruby test.rb
This is totally Ruby
ZOMG JavaScript
1
2
4
6
Arguments: a, b, c
Arguments: 1, 2, 3, 4, 5
This is Ruby again
%

JavaScript + Rails = <3

Because Rails embraces callbacks, this gem is the perfectly compliment for your Rails application. For example:

require "javascript"

class Post < ActiveRecord::Base
  before_create &javascript {
    function(post) {
      post.slug = post.title.parameterize();
    }
  }
end

Alternatively:

require "javascript"

class Post < ActiveRecord::Base
  before_create &javascript {
    function() {
      this.slug = this.title.parameterize();
    }
  }
end

No Conflict Mode

If the javascript helper conflicts with an existing method, you use this gem in the "no conflict" mode:

require "javascript/no_conflict"

# Or add this to your Gemfile:
#
#   gem "javascript", require: "javascript/no_conflict"
#

JavaScript.eval {
  console.log("JavaScript here");
}

# You can also define your own helper method

module Kernel
  private def metal(&block)
    JavaScript.eval(&block)
  end
end

metal {
  console.log("JavaScript here");
}

Pros

Gives you the illusion of programming in a closer to the metal syntax.
The examples in this README actually work.

Cons

Things that aren't covered in the examples probably won't ever work.
Not enough jQuery.

Contributing

Fork it ( https://github.com/chancancode/javascript/fork )
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create a new Pull Request

javascript

Development

Runtime