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Double exclamation points? [duplicate]
...foo".
!"foo" // Evaluates to false.
!!"foo" // Evaluates to true.
If foo.bar is passed through, then it may not be 0 but some other falsy value. See the following truth table:
Truth Table for javascript
'' == '0' // false
0 == '' // true
0 ...
Accessing Object Memory Address
...ch is guaranteed to be unique and
constant for this object during its
lifetime. Two objects with
non-overlapping lifetimes may have the
same id() value. (Implementation note:
this is the address of the object.)
So in CPython, this will be the address of the object. No such guarantee for ...
Read error response body in Java
...LConnection httpConn = (HttpURLConnection)_urlConnection;
InputStream _is;
if (httpConn.getResponseCode() < HttpURLConnection.HTTP_BAD_REQUEST) {
_is = httpConn.getInputStream();
} else {
/* error from server */
_is = httpConn.getErrorStream();
}
...
How to construct a std::string from a std::vector?
...
With C++11, you can do std::string(v.data()) or, if your vector does not contain a '\0' at the end, std::string(v.data(), v.size()).
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How to set HttpResponse timeout for Android in Java
...nt(httpParameters);
HttpResponse response = httpClient.execute(httpGet);
If you want to set the Parameters of any existing HTTPClient (e.g. DefaultHttpClient or AndroidHttpClient) you can use the function setParams().
httpClient.setParams(httpParameters);
...
Remove last character of a StringBuilder?
... @Harish: Possibly, a tiny, tiny bit - very unlikely to be significant though.
– Jon Skeet
Oct 24 '11 at 10:14
5
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Performance differences between debug and release builds
...frame. This is a big one, notable for making debugging optimized code so difficult. And giving the volatile keyword a meaning.
Array index checking elimination. An important optimization when working with arrays (all .NET collection classes use an array internally). When the JIT compiler can ver...
nginx - client_max_body_size has no effect
... It didn't work for me in location, worked in the server context. Not sure if it was being overridden, can't say.
– Dipen
Jun 12 '12 at 10:30
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cannot convert data (type interface {}) to type string: need type assertion
I am pretty new to go and I was playing with this notify package.
4 Answers
4
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Check whether variable is number or string in JavaScript
...
If you're dealing with literal notation, and not constructors, you can use typeof:.
typeof "Hello World"; // string
typeof 123; // number
If you're creating numbers and strings via a constructor, such as var foo ...