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Default initialization of std::array?
...zed (C++11 §8.5/11). That includes objects of type std::array<T, N> and T[N].
Be aware that there are types for which default initialization has no effect and leaves the object's value indeterminate: any non-class, non-array type (§8.5/6). Consequently, a default-initialized array of object...
How to dynamically build a JSON object with Python?
I am new to Python and I am playing with JSON data. I would like to dynamically build a JSON object by adding some key-value to an existing JSON object.
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How to check if an object is an array?
...Array.isArray(obj)
(Supported by Chrome 5, Firefox 4.0, IE 9, Opera 10.5 and Safari 5)
For backward compatibility you can add the following
# only implement if no native implementation is available
if (typeof Array.isArray === 'undefined') {
Array.isArray = function(obj) {
return Object.pr...
What is the difference between '&' and ',' in Java generics?
...you can restrict the type argument (in this case is T ) to extend a class and/or more interfaces with the 'and' operator ( & ) like this:
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How to export a Vagrant virtual machine to transfer it
I have a vagrant box up and running (configured with a LAMP stack). I need to transfer it to another PC. How can I export it?
I guess that I can get a file (or files) that can be copied to another PC, so there I can run some command to import the vagrant box.
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Replace duplicate spaces with a single space in T-SQL
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If you want to remove the spaces at the front and end of the string, then wrap the replace in an LTRIM, RTRIM and it will do it for you.
– Neil Knight
Mar 16 '10 at 15:54
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How do you convert an entire directory with ffmpeg?
How do you convert an entire directory/folder with ffmpeg via command line or with a batch script?
24 Answers
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Python 3 turn range to a list
...gh since you can come by the value of my_list[i] more efficiently (i + 1), and if you just need to iterate over it, you can just fall back on range.
Also note that on python2.x, xrange is still indexable1. This means that range on python3.x also has the same property2
1print xrange(30)[12] works ...
What does passport.session() middleware do?
...entication system using Passport.js using Easy Node Authentication: Setup and Local tutorial .
4 Answers
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RSpec: describe, context, feature, scenario?
... context , feature , scenario : What is the difference(s) among the four and when do I use each one?
3 Answers
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