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Should switch statements always contain a default clause?
...set of possible values. If you believe you know the set of possible values then, if the value is outside this set of possible values, you'd want to be informed of it - it's certainly an error.
That's the reason why you should always use a default clause and throw an error, for example in Java:
sw...
Is there a way to provide named parameters in a function call in JavaScript?
...ties of an object with the corresponding parameter.
A function call could then look like
func(a, b, {someArg: ..., someOtherArg: ...});
where a and b are positional arguments and the last argument is an object with named arguments.
For example:
var parameterfy = (function() {
var pattern =...
Join vs. sub-query
...e, and so I prefer to write queries first in a logically coherent way, and then restructure if performance constraints warrant this.
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How can I link to a specific glibc version?
...f (pthread_t),
"sizeof (thr) != sizeof (pthread_t)");
Then recompile and re-install glibc, and recompile and re-run our program:
cd glibc/build
make -j `nproc`
make -j `nproc` install
./test_glibc.sh
and we see hacked printed a few times as expected.
This further confirms th...
“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...commend using INSERT...ON DUPLICATE KEY UPDATE.
If you use INSERT IGNORE, then the row won't actually be inserted if it results in a duplicate key. But the statement won't generate an error. It generates a warning instead. These cases include:
Inserting a duplicate key in columns with PRIMARY ...
Calling a Method From a String With the Method's Name in Ruby
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Personally I would setup a hash to function references and then use the string as an index to the hash. You then call the function reference with it's parameters. This has the advantage of not allowing the wrong string to call something you don't want to call. The other way is to bas...
What is Weak Head Normal Form?
...l detect some situations where a subexpression is always needed and it can then evaluate it ahead of time. This is only an optimization, however, and you should not rely on it to save you from overflows).
This kind of expression, on the other hand, is completely safe:
data List a = Cons a (List a)...
Are tuples more efficient than lists in Python?
...ing a class ListLike with a __getitem__ that does something horribly slow, then disassemble x = ListLike((1, 2, 3, 4, 5)); y = x[2]. The bytecode will be more like the tuple example above than the list example, but do you really believe that means performance will be similar?
–...
Android preferences onclick event
...
Badr,
You need to set android:key for the item, Then in your code you can do...
Assuming you use the following in your XML:
<Preference android:title="About" android:key="myKey"></Preference>
Then you can do the following in your code:
Preference myPref = ...
Why does ~True result in -2?
...in(~True), bin(-2), bin(~1) all gives '-0b10' If -2 representation is 10 then why - sign.
– Grijesh Chauhan
Feb 19 '14 at 13:19
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