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Reversing a linked list in Java, recursively
...or a class for a while now. It is an implementation of a linked list (here called AddressList , containing simple nodes called ListNode ). The catch is that everything would have to be done with recursive algorithms. I was able to do everything fine sans one method: public AddressList reverse() ...
How to extend an existing JavaScript array with another array, without creating a new array
... then pushed to the back of the array. So a.push('x', 'y', 'z') is a valid call that will extend a by 3 elements. apply is a method of any function that takes an array and uses its elements as if they were all given explicitly as positional elements to the function. So a.push.apply(a, ['x', 'y', 'z'...
Why can't I define a default constructor for a struct in .NET?
...to declare parameterless constructors in structs - but they still won't be called in all situations (e.g. for array creation) (in the end this feature was not added to C# 6).
EDIT: I've edited the answer below due to Grauenwolf's insight into the CLR.
The CLR allows value types to have paramete...
Which is more efficient, a for-each loop, or an iterator?
...r form. Therefore, you should choose the form of loop that is most aesthetically appealing to you, for most people that will be the for-each loop, as that has less boilerplate code.
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Use 'import module' or 'from module import'?
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With that last example, can you still call 'foo.bar = "orange"' to update 'bar' inside 'foo'?
– velocirabbit
May 3 '15 at 21:42
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Call int() function on every list element?
... list comprehensions mentioned by adamk. Without the square brackets, it's called a generator expression, and is a very memory-efficient way of passing a list of arguments to a method. A good discussion is available here: Generator Expressions vs. List Comprehension
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(this == null) in C#!
...erGenerated method doesn't make sense; if you look at the IL (below), it's calling the method on a null string (!).
.locals init (
[0] string CS$1$0000)
L_0000: ldloc.0
L_0001: call instance string CompilerBug.Program/Derived::CheckNull()
L_0006: stloc.0
L_0007: br.s L_...
This type of CollectionView does not support changes to its SourceCollection from a thread different
...l); but it is giving syntax error. Look like Send method is expecting some callback method name. I have tried various options like delegate with parameter but it is not allowing to have my custom parameter. I am very new to this kind of syntax, so it would really helpful if you can provide me synt...
How to validate an email address in JavaScript
Is there a regular expression to validate an email address in JavaScript?
95 Answers
9...
Limit file format when using ?
...still, the accept attribute of <input type = "file"> can help to provide a filter in the file select dialog box of the OS. For example,
<!-- (IE 10+, Edge (EdgeHTML), Edge (Chromium), Chrome, Firefox 42+) -->
<input type="file" accept=".xls,.xlsx" />
should provide a way ...