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Using backticks around field names
...andating whether or not you can use backticks, they should have a standard for names. It solves more 'real' problems.
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How to check if object has any properties in JavaScript?
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You can loop over the properties of your object as follows:
for(var prop in ad) {
if (ad.hasOwnProperty(prop)) {
// handle prop as required
}
}
It is important to use the hasOwnProperty() method, to determine whether the object has the specified property as a direct ...
@try - catch block in Objective-C
...ective-C exceptions are what they are called. Exceptions! Don’t use them for error handling. It’s not their proposal.
Just check the length of the string before using characterAtIndex and everything is fine....
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Significance of -pthread flag when compiling
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Try:
gcc -dumpspecs | grep pthread
and look for anything that starts with %{pthread:.
On my computer, this causes files to be compiled with -D_REENTRANT, and linked with -lpthread. On other platforms, this could differ. Use -pthread for most portability.
Using _REENT...
DistutilsOptionError: must supply either home or prefix/exec-prefix — not both
...-and-Python.md calls out a known issue with pip and a work around.
Worked for me.
You can make this "empty prefix" the default by adding a
~/.pydistutils.cfg file with the following contents:
[install]
prefix=
Edit: Do not use this Homebrew recommended option, it will break normal pip ope...
JavaScript closure inside loops – simple practical example
...t and const keywords that are scoped differently than var-based variables. For example, in a loop with a let-based index, each iteration through the loop will have a new variable i with loop scope, so your code would work as you expect. There are many resources, but I'd recommend 2ality's block-scop...
How would you count occurrences of a string (actually a char) within a string?
...llows:
Your original = 12s
source.Count = 19s
source.Split = 17s
foreach (from bobwienholt's answer) = 10s
(The times are for 50,000,000 iterations so you're unlikely to notice much difference in the real world.)
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Find difference between timestamps in seconds in PostgreSQL
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Thanks a lot for the answer. It worked !!! In the above query, we are missing a closing parenthesis . But I have figured it out. Thanks a lot for your quick reply.
– Arun
Dec 26 '12 at 10:38
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Android : difference between invisible and gone?
What is the difference between invisible and gone for the View visibility status?
8 Answers
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What are unit tests, integration tests, smoke tests, and regression tests?
...on tests? What are the differences between them and which tools can I use for each of them?
17 Answers
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