Recently, I have been working with writing a ruby gem, Yoolk API Gem. What is really interesting for me is I do some meta programming and object-oriented programming in Ruby which I have never experienced before. A few month later, there is a requirement that my team needs to write in JavaScript, but I don’t want to touch JavaScript really much. Therefore, my team member took over this task. Whenever I write code in Ruby, I just try to think how to do it in JavaScript as well. Several things that came up to my mind with some from my team member:

• Defer class from a variable

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    var klass = "Person";
    p = new window[klass]; //class without namespace
    p = new yoolk[klass]; //class with namespace

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    klass = "Person"
    p = Object.const_get(klass).new #class without namespace
    p = Yoolk.const_get(klass).new #class with namespace

• Access class method from instance object

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    var p = new Person();
    p.constructor.getCount();

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    p = Person.new
    p.class.count

• Define method of an object

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    var p = new Person();
    p.hello = function() {
      alert('hello');
    };

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    p = Person.new
    def p.hello
      puts "hello"
    end

• Define class methods

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    Person.hello = function() {
      alert('hello');
    };

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    def Person.hello
      puts "hello"
    end