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What does ||= (or-equals) mean in Ruby?
...ling-list that discuss this issue.
Here's one: The definitive list of ||= (OR Equal) threads and pages
If you really want to know what is going on, take a look at Section 11.4.2.3 "Abbreviated assignments" of the Ruby Language Draft Specification.
As a first approximation,
a ||= b
is equivalent to
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Why do you need explicitly have the “self” argument in a Python method?
...cit rather than based on a rule.
Additionally, since nothing is implied or assumed, parts of the implementation are exposed. self.__class__, self.__dict__ and other "internal" structures are available in an obvious way.
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What is DOCTYPE?
...use the DOCTYPE to determine how to render a page. Not including a DOCTYPE or including an incorrect one can trigger quirks mode.
The kicker here is, that quirks mode in Internet Explorer is quite different from quirks mode in Firefox (and other browsers); meaning that you'll have a much harder job...
How to get a key in a JavaScript object by its value?
... associative array. Is there a simple function allowing me to get the key for a value, or do I have to iterate the object and find it out manually?
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JavaScript check if variable exists (is defined/initialized)
Which method of checking if a variable has been initialized is better/correct?
(Assuming the variable could hold anything (string, int, object, function, etc.))
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Could someone explain the pros of deleting (or keeping) unused code?
...hat unused code must be deleted from the project.
However it is not clear for me "why?".
11 Answers
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RequestDispatcher.forward() vs HttpServletResponse.sendRedirect()
What is the conceptual difference between forward() and sendRedirect() ?
9 Answers
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How do you get the logical xor of two variables in Python?
How do you get the logical xor of two variables in Python?
24 Answers
24
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RegEx for Javascript to allow only alphanumeric
... find a reg ex that only allows alphanumeric. So far, everyone I try only works if the string is alphanumeric, meaning contains both a letter and a number. I just want one what would allow either and not require both.
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MongoDB or CouchDB - fit for production? [closed]
I was wondering if anyone can tell me if MongoDB or CouchDB are ready for a production environment.
19 Answers
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