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:
ruby
gem 'javascript'
And then execute:
$ bundle
Or install it yourself as:
$ gem install javascript
Usage
```ruby 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:
```ruby require “javascript”
class Post < ActiveRecord::Base before_create &javascript { function(post) { post.slug = post.title.parameterize(); } } end ```
Alternatively:
```ruby 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:
```ruby 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