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How does collections.defaultdict work?
...igure out what this method means. Can somebody help? Here are two examples from the python docs
15 Answers
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Is there auto type inferring in Java?
...t this was closed as "Will not fix", reason given was :
Humans benefit from the redundancy of the type declaration in two ways.
First, the redundant type serves as valuable documentation - readers do not
have to search for the declaration of getMap() to find out what type it
r...
Get keys from HashMap in Java
...ke BidiMap (a map that allows bidirectional lookup between key and values) from Apache's Commons Collections - also be aware that several different keys could be mapped to the same value.
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Why use Object.prototype.hasOwnProperty.call(myObj, prop) instead of myObj.hasOwnProperty(prop)?
If I understand correctly, each and every object in Javascript inherits from the Object prototype, which means that each and every object in Javascript has access to the hasOwnProperty function through its prototype chain.
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How do I pass a variable by reference?
...ay, struct, whatever), but you couldn't change the pointer that was copied from the outer scope - when you were done with the function, the original pointer still pointed to the same address. C++ introduced references, which behaved differently.
– Blair Conrad
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Is it possible to implement dynamic getters/setters in JavaScript?
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2013 and 2015 Update (see below for the original answer from 2011):
This changed as of the ES2015 (aka "ES6") specification: JavaScript now has proxies. Proxies let you create objects that are true proxies for (facades on) other objects. Here's a simple example that turns any pro...
Running code in main thread from another thread
...hat I need to update it. Since the original answer was posted, the comment from @dzeikei has gotten almost as much attention as the original answer. So here are 2 possible solutions:
1. If your background thread has a reference to a Context object:
Make sure that your background worker threads hav...
What is boxing and unboxing and what are the trade offs?
... which is ever so convenient. Primitives (in Java at least) don't descend from Object, can't have fields, can't have methods, and just generally behave very differently from other types of values. On the other hand, working with them can be very fast and space efficient. Thus the trade off.
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java.io.Console support in Eclipse IDE
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I assume you want to be able to use step-through debugging from Eclipse. You can just run the classes externally by setting the built classes in the bin directories on the JRE classpath.
java -cp workspace\p1\bin;workspace\p2\bin foo.Main
You can debug using the remote debugger an...
Java “Virtual Machine” vs. Python “Interpreter” parlance?
...know as the Java VM is not really Java specific. You could make a compiler from other languages that result in byte codes that can be run on the JVM. On the other hand, I don't think we would really think of "compiling" some other language other than Python into Python for interpretation by the Pyth...