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When should I use the Visitor Design Pattern? [closed]
... sure they do explain it – it’s the same advantage that you always get from subclassing / runtime polymorphism over switch: switch hard-codes the decision making at the client side (code duplication) and doesn’t offer static type checking (check for completeness and distinctness of cases etc.)...
Any difference between First Class Function and High Order Function
...d where parameters that are functions are treated specially, and different from "ordinary" value parameters).
So the presence of first-class functions (as a language feature) implies the presence of higher-order functions, but not the other way round.
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Node.js Web Application examples/tutorials [closed]
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Update
Dav Glass from Yahoo has given a talk at YuiConf2010 in November which is now available in Video from.
He shows to great extend how one can use YUI3 to render out widgets on the server side an make them work with GET requests when JS ...
Equivalent of varchar(max) in MySQL?
... these column types stored their data as a collection of 8K pages separate from the table data pages; they supported storing up to 2GB per row.
The big caveat to these column types was that they usually required special functions and statements to access and modify the data (e.g. READTEXT, WRITETEXT...
Why do variable names often start with the letter 'm'? [duplicate]
... with the letter 'm'. What convention is this, and where does it originate from?
8 Answers
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So, JSONP or CORS? [closed]
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I recently developed a web app, using jquery and backbone.js, which reads from various cross-domain web services that we control, and ended up using Json-P instead of CORS because we need to support IE7 and it was a bit simpler on the server side (we run Django w/ DjangoRestFramework), and virtuall...
How to create default value for function argument in Clojure
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So easy to understand if coming from a Python background :)
– Dan
Mar 6 '12 at 12:17
1
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Npm Please try using this command again as root/administrator
...an error as preceding.
npm ERR! As of npm@5, the npm cache self-heals from corruption issues and data extracted from the cache is guaranteed to be valid. If you want to make sure everything is consistent, use 'npm cache verify' instead.
(Source: MSDN Blog post)
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The 3 different equals
...es i.e. "5 is not a number" == 5 can lead to wacky bugs. === never suffers from this problem.
– gnarf
Nov 12 '13 at 5:00
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Rails has_and_belongs_to_many migration
...ils 5
rails g migration CreateJoinTableRestaurantUser restaurants users
From the docs:
There is also a generator which will produce join tables if JoinTable
is part of the name:
Your migration file (note the :id => false; it's what prevents the creation of a primary key):
Rails 3
c...