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Is JavaScript's “new” keyword considered harmful?
... to every object I create, I could just write a creation function that manually assigns each method to each new object... Or, I could assign them to the creation function's prototype and use new to stamp out new objects. Not only is this faster (no code needed for each and every method on the protot...
How to create a generic array in Java?
...tly what type of objects it contains (i.e. its constructor was explicitly called with a Class<E> argument, and methods will throw an exception when they are passed arguments that are not of type E. See Collections.checkedCollection.
-> in that case, you should write:
public class GenSet&l...
What's the state of the art in email validation for Rails?
... answered Aug 24 '10 at 9:56
HallelujahHallelujah
77466 silver badges44 bronze badges
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Google Guava isNullOrEmpty for collections
...eyard."
We don't believe that "is null or empty" is a question you ever really want to be asking about a collection.
If a collection might be null, and null should be treated the same as empty, then get all that ambiguity out of the way up front, like this:
Set<Foo> foos = NaughtyClass.getF...
How to iterate over the keys and values with ng-repeat in AngularJS?
... a core team member regret ever implementing the ability to do so! It's usually better to transform the object in the controller to an array; this makes the intent clearer and decreases the risk for strange/unpredictable behavior in certain cases. And you can sort in the usual way. :-)
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How to disable an input type=text?
...ay to prevent it is with server side logic.
– Aaron Wallentine
Jul 18 '16 at 21:50
add a comm...
How do you specify a byte literal in Java?
...imple helper method byte b(int i) { return (byte) i; } somewhere and statically import it. Then you can write f(b(10)).
– Yona Appletree
Oct 11 '13 at 18:56
add a comment
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C++ template constructor
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There is no way to explicitly specify the template arguments when calling a constructor template, so they have to be deduced through argument deduction. This is because if you say:
Foo<int> f = Foo<int>();
The <int> is the template argument list for the type Foo, not fo...
Swift - How to convert String to Double
...ocumentation:(They are not locale-aware) The following convenience methods all skip initial space characters (whitespaceSet) and ignore trailing characters. They are not locale-aware. NSScanner or NSNumberFormatter can be used for more powerful and locale-aware parsing of numbers.
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What does default(object); do in C#?
... value
For Nullable<T> it returns the empty (pseudo-null) value (actually, this is a re-statement of the first bullet, but it is worth making it explicit)
The biggest use of default(T) is in generics, and things like the Try... pattern:
bool TryGetValue(out T value) {
if(NoDataIsAvailab...