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How do I check in JavaScript if a value exists at a certain array index?
...fined and not null. It's possible to add members to an array without ever setting their value: for example, if you add array values by increasing the array.length property, any new values will be undefined.
To determine if a given value is something meaningful, or has been defined. That is, not...
What does 'COLLATE SQL_Latin1_General_CP1_CI_AS' do?
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It sets how the database server sorts (compares pieces of text). in this case:
SQL_Latin1_General_CP1_CI_AS
breaks up into interesting parts:
latin1 makes the server treat strings using charset latin 1, basically ascii
CP1 ...
Thread context switch Vs. process context switch
...oming thread runs in another process, kernel performs one additional step: sets new active virtual address space.
The main cost in both scenarios is related to a cache pollution. In most cases, the working set used by the outgoing thread will differ significantly from working set which is used by t...
Unable to find specific subclass of NSManagedObject
...eate a Swift managed object subclass for the entity, the
"Module" field is set to "Current Product Module", and with this setting
creating instances works both in the main application and in unit tests.
The managed object subclass must not be marked with @objc(classname) (this was observed in https:...
random.seed(): What does it do?
...erate random numbers between 1 and 10 one after another. So you assume one set of numbers for one seed value.
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Percentage width in a RelativeLayout
... can replace the buttons with some EditText to fit your needs.
Be sure to set the layout_width to 0dp or your views may not be scaled properly.
Note that the weight sum doesn't have to equal 1, I just find it easier to read like this. You can set the first weight to 7 and the second to 3 and it wi...
jQuery UI - Close Dialog When Clicked Outside
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Very nice. I just changed it to this so I didn't have to set the ID reference explicitly: $('.ui-widget-overlay').bind('click', function () { $(this).siblings('.ui-dialog').find('.ui-dialog-content').dialog('close'); });
– James McCormack
Dec ...
PyCharm shows unresolved references error for valid code
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For anybody still confused (in PyCharm 3.4.1): Settings > Project Settings > Project Interpreter > Project Interpreters (gear button > more) > --Select the interpreter-- > Interpreter Paths (Directory Tree button on the right) > Reload List of Paths (...
PHP - include a php file and also send query parameters
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I have ran into this when doing ajax forms where I include multiple field sets. Taking for example an employment application. I start out with one professional reference set and I have a button that says "Add More". This does an ajax call with a $count parameter to include the input set again (n...
Git push error '[remote rejected] master -> master (branch is currently checked out)'
Yesterday, I posted a question on how to clone a Git repository from one of my machines to another, How can I 'git clone' from another machine? .
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