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What is a mixin, and why are they useful?

In " Programming Python ", Mark Lutz mentions "mixins". I'm from a C/C++/C# background and I have not heard the term before. What is a mixin? ...
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How do I get the number of elements in a list?

Consider the following: 9 Answers 9 ...
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What is the difference between JVM, JDK, JRE & OpenJDK?

What is the difference between JVM , JDK , JRE & OpenJDK ? 19 Answers 19 ...
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Is there a way to iterate over a dictionary?

I know NSDictionaries as something where you need a key in order to get a value . But how can I iterate over all keys and values in a NSDictionary , so that I know what keys there are, and what values there are? I know there is something called a for-in-loop in JavaScript . Is there som...
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How do I get the YouTube video ID from a URL?

I want to get the v=id from YouTube’s URL with JavaScript (no jQuery, pure JavaScript). 39 Answers ...
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Plain Old CLR Object vs Data Transfer Object

POCO = Plain Old CLR (or better: Class) Object 10 Answers 10 ...
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How to get current foreground activity context in android?

Whenever my broadcast is executed I want to show alert to foreground activity. 14 Answers ...
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How can I loop through a List and grab each item?

How can I loop through a List and grab each item? 4 Answers 4 ...
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Pass mouse events through absolutely-positioned element

I'm attempting to capture mouse events on an element with another absolutely-positioned element on top of it. 6 Answers ...
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How to put spacing between TBODY elements

I have a table like this: 12 Answers 12 ...