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What is a stack trace, and how can I use it to debug my application errors?
...ead "main" java.lang.NullPointerException
at com.example.myproject.Book.getTitle(Book.java:16)
at com.example.myproject.Author.getBookTitles(Author.java:25)
at com.example.myproject.Bootstrap.main(Bootstrap.java:14)
This is a very simple stack trace. If we start at the begi...
Pretty git branch graphs
I've seen some books and articles have some really pretty looking graphs of git branches and commits. How can I make high-quality printable images of git history?
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How to ignore all hidden directories/files recursively in a git repository?
...wered Nov 5 '11 at 16:18
Daniel BöhmerDaniel Böhmer
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How do I lowercase a string in Python?
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edited Feb 13 '19 at 16:23
Alan W. Smith
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JavaScript exponents
...ification. It is supposed to work in a similar manner with python and matlab:
a**b // will rise a to the power b
Now it is already implemented in Edge14, Chrome52, and also it is available with traceur or babel.
share
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nonlocal keyword in Python 2.x
... to implement a closure in Python 2.6 and I need to access a nonlocal variable but it seems like this keyword is not available in python 2.x. How should one access nonlocal variables in closures in these versions of python?
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How to throw a C++ exception
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Simple:
#include <stdexcept>
int compare( int a, int b ) {
if ( a < 0 || b < 0 ) {
throw std::invalid_argument( "received negative value" );
}
}
The Standard Library comes with a nice collection of built-in exception objects you can throw. Keep in mind ...
Printing HashMap In Java
...g these keys.
In your example, the type of the hashmap's key is TypeKey, but you specified TypeValue in your generic for-loop, so it cannot be compiled. You should change it to :
for (TypeKey name: example.keySet()){
String key = name.toString();
String value = example.get...
Is there a constraint that restricts my generic method to numeric types?
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C# does not support this. Hejlsberg has described the reasons for not implementing the feature in an interview with Bruce Eckel:
And it's not clear that the added complexity is worth the small yield that you get. If something you want to do is not dire...
When to use nested classes and classes nested in modules?
I'm pretty familiar with when to use subclasses and modules, but more recently I've been seeing nested classes like this:
5...