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How do I set up DNS for an apex domain (no www) pointing to a Heroku app?

... (Note: root, base, apex domains are all the same thing. Using interchangeably for google-foo.) Traditionally, to point your apex domain you'd use an A record pointing to your server's IP. This solution doesn't scale and isn't viable for a cloud platform like H...
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What does @@variable mean in Ruby?

...the classes; setting the value in an instance of one changes the value for all other instances of that class and even child classes, where a variable named @shared, with one @, would not be. [Update] As Phrogz mentions in the comments, it's a common idiom in Ruby to track class-level data with an ...
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What are the precise rules for when you can omit parenthesis, dots, braces, = (functions), etc.?

...can omit dot when using the prefix, infix and postfix notations -- the so called operator notation. While using the operator notation, and only then, you can omit the parenthesis if there is less than two parameters passed to the method. Now, the operator notation is a notation for method-call, whi...
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Animation CSS3: display + opacity

... to support all browsers.. ? – david_adler Oct 25 '13 at 16:41 ...
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Why is it necessary to set the prototype constructor?

...}; // define the Student class function Student(name) { Person.call(this, name); } // inherit Person Student.prototype = Object.create(Person.prototype); Now what happens when we create a new Student and copy it? var student1 = new Student("trinth"); console.log(student1....
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Design Patterns web based applications [closed]

... harder to implement. But you end up with a simpler model and view wherein all the "raw" Servlet API is abstracted completely away. You shouldn't have the need to gather, convert and validate the request parameters yourself. The Controller does this task and sets the gathered, converted and validate...
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What is Weak Head Normal Form?

... further (i.e. it contains no un-evaluated thunks). These expressions are all in normal form: 42 (2, "hello") \x -> (x + 1) These expressions are not in normal form: 1 + 2 -- we could evaluate this to 3 (\x -> x + 1) 2 -- we could apply the function "he" ++ "llo" ...
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What are MVP and MVC and what is the difference?

... many tools encourage you are likely to come across three design patterns called Model-View-Controller , Model-View-Presenter and Model-View-ViewModel . My question has three parts to it: ...
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Error handling in C code

... your library as painless as possible think about these additions: store all possible error-states in one typedef'ed enum and use it in your lib. Don't just return ints or even worse, mix ints or different enumerations with return-codes. provide a function that converts errors into something huma...
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Why does ~True result in -2?

...00000001 and ~1 is: 11111110 Which is -2 in Two's complement1 1 Flip all the bits, add 1 to the resulting number and interpret the result as a binary representation of the magnitude and add a negative sign (since the number begins with 1): 11111110 → 00000001 → 00000010 ↑ ...