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What is the proper declaration of main?
...e that all of this applies only when compiling for a hosted environment (informally, an environment where you have a full standard library and there's an OS running your program). It is also possible to compile a C++ program for a freestanding environment (for example, some types of embedded system...
In Django, how does one filter a QuerySet with dynamic field lookups?
...nt expansion may be used to solve this problem:
kwargs = {
'{0}__{1}'.format('name', 'startswith'): 'A',
'{0}__{1}'.format('name', 'endswith'): 'Z'
}
Person.objects.filter(**kwargs)
This is a very common and useful Python idiom.
...
How to check file MIME type with javascript before upload?
...that the real validation still has to be done on server side. I want to perform a client side checking to avoid unnecessary wastage of server resource.
...
Mongodb Explain for Aggregation framework
...ns
As at MongoDB 3.4, the Aggregation Framework explain option provides information on how a pipeline is processed but does not support the same level of detail as the executionStats mode for a find() query. If you are focused on optimizing initial query execution you will likely find it beneficial...
Shell equality operators (=, ==, -eq)
...riting a #!/bin/bash script then I recommend using [[ instead. The doubled form has more features, more natural syntax, and fewer gotchas that will trip you up. Double quotes are no longer required around $a, for one:
$ [[ $a == foo ]]; echo "$?" # bash specific
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See also:
What's the diff...
How to Set focus to first text input in a bootstrap modal after shown
...nt data-targets, rename your modals IDs to match and update the IDs of the form input fields, and finally update your JS to match these new IDs:
see http://jsfiddle.net/panchroma/owtqhpzr/5/
HTML
...
<button ... data-target="#myModal1"> ... </button>
...
<!-- Modal 1 -->
&l...
How to change an input button image using CSS?
...ou'll need to place an image and have an onclick function that submits the form.
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How to access command line arguments of the caller inside a function?
...unction print() { is an amalgam between two different function declaration forms -- function print {, which is legacy ksh syntax that bash supports for backwards compatibility with pre-POSIX (which is to say, pre-1991) ksh, and print() {, which is POSIX-standardized. Consider using one or the other ...
How to style the option of an html “select” element?
...ays it "supports the latest, stable releases of all major browsers and platforms"
Demo: https://developer.snapappointments.com/bootstrap-select/examples/
.special {
font-weight: bold !important;
color: #fff !important;
background: #bc0000 !important;
text-transform: uppercase;
}
...
C# namespace alias - what's the point?
...pace alias; it is useful to disambiguate - for example, against:
using WinformTimer = System.Windows.Forms.Timer;
using ThreadingTimer = System.Threading.Timer;
(ps: thanks for the choice of Timer ;-p)
Otherwise, if you use both System.Windows.Forms.Timer and System.Timers.Timer in the same file...