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When to wrap quotes around a shell variable?

Could someone tell me whether or not I should wrap quotes around variables in a shell script? 5 Answers ...
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How do I format a date in Jinja2?

Using Jinja2, how do I format a date field? I know in Python I can simply do this: 9 Answers ...
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What's the difference between lapply and do.call?

I'm learning R recently and confused by two function: lapply and do.call . It seems that they're just similar to map function in Lisp. But why are there two functions with such a different name? Why doesn't R just use a function called map ? ...
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What is the most robust way to force a UIView to redraw?

I have a UITableView with a list of items. Selecting an item pushes a viewController that then proceeds to do the following. from method viewDidLoad I fire off a URLRequest for data that is required by on of my subviews - a UIView subclass with drawRect overridden. When the data arrives from the clo...
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simulate background-size:cover on or

How can I simulate the functionality of background-size:cover on an html element like <video> or <img> ? 1...
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Inserting a Python datetime.datetime object into MySQL

I have a date column in a MySQL table. I want to insert a datetime.datetime() object into this column. What should I be using in the execute statement? ...
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How to reset AUTO_INCREMENT in MySQL?

How can I reset the AUTO_INCREMENT of a field? I want it to start counting from 1 again. 24 Answers ...
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Which would be better for concurrent tasks on node.js? Fibers? Web-workers? or Threads?

I stumbled over node.js sometime ago and like it a lot. But soon I found out that it lacked badly the ability to perform CPU-intensive tasks. So, I started googling and got these answers to solve the problem: Fibers, Webworkers and Threads (thread-a-gogo). Now which one to use is a confusion and one...
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JQuery .each() backwards

I'm using JQuery to select some elements on a page and then move them around in the DOM. The problem I'm having is I need to select all the elements in the reverse order that JQuery naturally wants to select them. For example: ...
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Create code first, many to many, with additional fields in association table

I have this scenario: 6 Answers 6 ...