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How to check 'undefined' value in jQuery
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JQuery library was developed specifically to simplify and to unify certain JavaScript functionality.
However if you need to check a variable against undefined value, there is no need to invent any special method, since JavaScript has a typeof operator, which is simple, fast and...
How to select rows with no matching entry in another table?
I'm doing some maintenance work on a database application and I've discovered that, joy of joys, even though values from one table are being used in the style of foreign keys, there's no foreign key constraints on the tables.
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How do I update pip itself from inside my virtual environment?
...ng to pip --version , I currently have pip 1.1 installed in my virtualenv and I want to update to the latest version.
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Ruby Regexp group matching, assign variables on 1 line
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Beware that if no matches are found, match returns nil and you get a NilError. If you are in Rails, I suggest you to change: one, two, three = string.match(/(^.*)(:)(.*)/i).captures into: one, two, three = string.match(/(^.*)(:)(.*)/i).try(:captures)
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Store query result in a variable using in PL/pgSQL
...at will pull the name from test_table where id is your function's argument and leave it in the name variable. Don't leave out the table name prefix on test_table.name or you'll get complaints about an ambiguous reference.
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How to jump to a specific character in vim?
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You can type f<character> to put the cursor on the next character and F<character> for the previous one.
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Check if instance is of a type
... A small note: use "is" if you don't want to use the result of the cast and use "as" if you do.
– Aviram Fireberger
Nov 10 '15 at 14:55
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Bootstrap modal: background jumps to top on toggle
...e the css for .modal-open class. But, what if there is extra closing divs, and in my answer, I have not override any classes in my resolution? It works fine after removing 2 extra divs. bs modal adding .modal-backdrop div which will get confused where it needed to be closed because of extra closing ...
How to remove trailing whitespace of all files recursively?
...he trailing whitespace of an entire project? Starting at a root directory, and removing the trailing whitespace from all files in all folders.
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Using git to get just the latest revision
...o track a project that uses git. I don't want to clone the full repository and the full history, I just want the latest revision, and I want to be able to update to new revisions from the remote project.
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