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Test if something is not undefined in JavaScript
I'm checking if(response[0].title !== undefined) , but I get the error:
11 Answers
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Which version of MVC am I using?
...ome reason, feeling a little dumb. How do I know? I'm using .net 4 with VS2010.
9 Answers
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What is the default initialization of an array in Java?
...hing that holds an object) that is null.
For int/short/byte/long that is a 0.
For float/double that is a 0.0
For booleans that is a false.
For char that is the null character '\u0000' (whose decimal equivalent is 0).
When you create an array of something, all entries are also zeroed. So your arra...
The most efficient way to implement an integer based power function pow(int, int)
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answered Sep 19 '08 at 12:54
Elias YarrkovElias Yarrkov
3,99311 gold badge1414 silver badges66 bronze badges
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How to use regex with find command?
I have some images named with generated uuid1 string. For example 81397018-b84a-11e0-9d2a-001b77dc0bed.jpg. I want to find out all these images using "find" command:
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Error “initializer element is not constant” when trying to initialize variable with const
... C language, the term "constant" refers to literal constants (like 1, 'a', 0xFF and so on), enum members, and results of such operators as sizeof. Const-qualified objects (of any type) are not constants in C language terminology. They cannot be used in initializers of objects with static storage dur...
Why does running the Flask dev server run itself twice?
...o away, but then you also lose the reloading functionality:
app.run(port=4004, debug=config.DEBUG, host='0.0.0.0', use_reloader=False)
You can disable the reloader when using the flask run command too:
FLASK_DEBUG=1 flask run --no-reload
You can look for the WERKZEUG_RUN_MAIN environment varia...
How to write a Ruby switch statement (case…when) with regex and backreferences?
... groups are always stored in pseudo variables $1 to $9:
case foo
when /^([0-9][0-9])/
print "the month is #{$1}"
else
print "something else"
end
You can also use the $LAST_MATCH_INFO pseudo variable to get at the whole MatchData object. This can be useful when using named captures:
case ...
How to remove last n characters from every element in the R vector
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answered May 1 '14 at 17:50
nfmcclurenfmcclure
2,25711 gold badge1919 silver badges3535 bronze badges
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How to sort with a lambda?
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edited Feb 25 '11 at 23:06
answered Feb 25 '11 at 22:51
B...