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Rearrange columns using cut
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For the cut(1) man page:
Use one, and only one of -b, -c or -f. Each LIST is made up of
one
range, or many ranges separated by commas. Selected input is written
in the same order that it is read, and is written exactly once.
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what is reverse() in Django
...code. This violates DRY (Don't Repeat Yourself), the whole idea of editing one place only, which is something to strive for.
Instead, you can say:
from django.urls import reverse
return HttpResponseRedirect(reverse('url_name'))
This looks through all urls defined in your project for the url defi...
make_unique and perfect forwarding
...n the future.
He also gives an implementation that is identical with the one given by the OP.
Edit: std::make_unique now is part of C++14.
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Find and kill a process in one line using bash and regex
...p '[s]leep' which doesn't have sleep in it.
When I was shown this (by someone here on SO), I immediately started using it because
it's one less process than adding | grep -v grep; and
it's elegant and sneaky, a rare combination :-)
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How to get unique values in an array
...s the kind if geeky javascript-nerd answer that should only be used by someone who understands what it means, and possibly not even then. What it is saying, is that writing if (~a.indexOf(b)) ... is identical to writing the longer if (a.indexOf(b) == -1) ....
– Orwellophile
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Single vs double quotes in JSON
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but first one it's single quote in JSON, I am confused. That one can pass compile but the second one can't.
– Bin Chen
Nov 12 '10 at 8:04
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Entity Framework 4 Single() vs First() vs FirstOrDefault()
... times while the same context is alive.
Single() - when you expect exactly one item to be returned by a query. This will throw an exception if the query does not return exactly one item.
SingleOrDefault() - when you expect zero or one items to be returned by a query (i.e. you are not sure if an item...
How does having a dynamic variable affect performance?
... call site is part of the Dynamic Language Runtime. The DLR says "hmm, someone is attempting to do a dynamic invocation of a method foo on this here object. Do I know anything about that? No. Then I'd better find out."
The DLR then interrogates the object in d1 to see if it is anything special. Ma...
Click outside menu to close in jquery
...lick occurs on your page. To avoid that, you can add the listener for just one time :
$('a#menu-link').on('click', function(e) {
e.preventDefault();
e.stopPropagation();
$('#menu').toggleClass('open');
$(document).one('click', function closeMenu (e){
if($('#menu').has(e.ta...
Copy values from one column to another in the same table
How can I make a copy values from one column to another? I have:
7 Answers
7
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