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Most efficient way to make the first character of a String lower case?
...est4 used StringBuilder.
StringBuilder sb = new StringBuilder(string);
sb.setCharAt(0, Character.toLowerCase(sb.charAt(0)));
string = sb.toString();
test5 used two substring() calls.
string = string.substring(0, 1).toLowerCase() + string.substring(1);
test6 uses reflection to change char value[]...
What is scope/named_scope in rails?
...
A scope is a subset of a collection. Sounds complicated? It isn't. Imagine this:
You have Users. Now, some of those Users are subscribed to your newsletter. You marked those who receive a newsletter by adding a field to the Users Database (...
How to horizontally center a
...:
#inner {
width: 50%;
margin: 0 auto;
}
Of course, you don't have to set the width to 50%. Any width less than the containing <div> will work. The margin: 0 auto is what does the actual centering.
If you are targeting Internet Explorer 8 (and later), it might be better to have this ins...
How to export collection to CSV in MongoDB?
.... do this by peeking into the first document in the collection and get his set of keys
keys=`mongo "$host/$dbname" -u $user -p $pass --eval "rs.slaveOk();var keys = []; for(var key in db.${collectionArray[$i]}.find().sort({_id: -1}).limit(1)[0]) { keys.push(key); }; keys;" --quiet`;
# now us...
Are there legitimate uses for JavaScript's “with” statement?
...e this can lead to errors:
for (var i=0; i<3; ++i)
{
var num = i;
setTimeout(function() { alert(num); }, 10);
}
Because the for loop does not introduce a new scope, the same num - with a value of 2 - will be shared by all three functions.
A new scope: let and with
With the introduction of ...
What does addChildViewController actually do?
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Why is whitespace sometimes needed around metacharacters?
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Visual Studio support for new C / C++ standards?
...clear that:
Our primary goal is to support "most of C99/C11 that is a subset of ISO C++98/C++11."
We also for historical reasons ship a C90 compiler which accepts (only) C90 and not C++
We do not plan to support ISO C features that are not part of either C90 or ISO C++.
The blog post add links a...
What does “:=” do?
...body already said "assignment" operator. Bringing clarity to what is being set to where as opposed to the logical operator of equivalence.
In Mathematics it is like equals but A := B means A is defined as B, a triple bar equals can be used to say it's similar and equal by definition but not always ...
Difference: std::runtime_error vs std::exception()
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