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Use cases for the 'setdefault' dict method

The addition of collections.defaultdict in Python 2.5 greatly reduced the need for dict 's setdefault method. This question is for our collective education: ...
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How can I create a two dimensional array in JavaScript?

I have been reading online and some places say it isn't possible, some say it is and then give an example and others refute the example, etc. ...
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Stripping everything but alphanumeric chars from a string in Python

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What's the $unwind operator in MongoDB?

This is my first day with MongoDB so please go easy with me :) 6 Answers 6 ...
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Javascript: negative lookbehind equivalent?

Is there a way to achieve the equivalent of a negative lookbehind in javascript regular expressions? I need to match a string that does not start with a specific set of characters. ...
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How to align center the text in html table row?

I am using an HTML <table> and I want to align the text of <td> to the center in each cell. 7 Answers ...
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Differences between Java 8 Date Time API (java.time) and Joda-Time

I know there are questions relating to java.util.Date and Joda-Time. But after some digging, I couldn't find a thread about the differences between the java.time API (new in Java 8 , defined by JSR 310 ) and Joda-Time . ...
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What does `someObject.new` do in Java?

In Java, I have just found out that the following code is legal: 5 Answers 5 ...
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Build an ASCII chart of the most commonly used words in a given text [closed]

Build an ASCII chart of the most commonly used words in a given text. 59 Answers 59 ...
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Add new item count to icon on button - Android

I'm developer. I need to implement design shown below. I already have functional app but wonder how to even approach this? Particulary, I'm interested in how to show Number of "New" items under tabs. What I KNOW how to do - is create new icons with red dots and just display them when new stuff avail...