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What is the difference between typeof and instanceof and when should one be used vs. the other?
...make things clear, you need to know two facts:
The instanceof operator tests whether the prototype property of a constructor appears anywhere in the prototypes chain of an object. In most cases this mean that the object was created by using this constructor or on of its descendant. But also prot...
Difference between rake db:migrate db:reset and db:schema:load
...ironment. If RAILS_ENV is not specified it defaults to the development and test databases.
db:create:all - Creates the database for all environments.
db:drop - Drops the database for the current RAILS_ENV environment. If RAILS_ENV is not specified it defaults to the development and test databases....
Convert XML to JSON (and back) using Javascript
...Sample:// XML string to JSON var xmlText = "<MyOperation><test>Success</test><test2><item>ddsfg</item><item>dsdgfdgfd</item></test2></MyOperation>"; var jsonObj = X2JS.xml_str2json( xmlText ); alert (jsonObj.MyOperation.test...
Check if a given key already exists in a dictionary
I wanted to test if a key exists in a dictionary before updating the value for the key.
I wrote the following code:
16 Answ...
Check for null in foreach loop
...> in the answer you link to. Which have the same performance penalty of testing whether the enumerable is null.
– Rune FS
May 3 '19 at 9:36
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Create folder with batch but only if it doesn't already exist
...e a directory only if the folder does not exist.
Note that this existence test will return true only if VTS exists and is a directory. If it is not there, or is there as a file, the mkdir command will run, and should cause an error. You might want to check for whether VTS exists as a file as well...
What is the point of a “Build Server”? [closed]
...traceable. Developers manually building code for anything except their own testing is dangerous. Too much risk of stuff not getting checked in, being out of date with other people's changes, etc. etc.
Joel Spolsky on this matter.
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How do I iterate over an NSArray?
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The results of the test and source code are below (you can set the number of iterations in the app). The time is in milliseconds, and each entry is an average result of running the test 5-10 times. I found that generally it is accurate to 2-3 s...
When should Flask.g be used?
...t knows not to pop the AppContext just yet. The same thing occurs with the test client, which retains the context, so it can be inspected.
– theY4Kman
Jul 29 '17 at 21:04
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Check if string ends with one of the strings from a list
... str.endswith also accepts a tuple. You don't need to loop.
>>> 'test.mp3'.endswith(('.mp3', '.avi'))
True
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