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Checking if a variable is not nil and not zero in ruby
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You could do this:
if (!discount.nil? && !discount.zero?)
The order is important here, because if discount is nil, then it will not have a zero? method. Ruby's short-circuit evaluation should prevent it from trying to evaluate discount.zero?, however, if discount is nil.
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How to create a directory and give permission in single command
...group what I just made (yodirectory),
# (owner,group,others--in that order) where I made it (i.e. in mahome)
#
Now, to add just a tiny bit more about those octal permissions. When you make a directory, "your system" take your default directory perms' [which applies for new d...
Meaning of “[: too many arguments” error from if [] (square brackets)
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What is the difference between decodeURIComponent and decodeURI?
...d the same question, but didn't find the answer here, I made some tests in order to figure out what the difference actually is.
I did this, since I need the encoding for something, which is not URL/URI related.
encodeURIComponent("A") returns "A", it does not encode "A" to "%41"
decodeURIComponent...
Postgres: SQL to list table foreign keys
... pg_catalog.pg_constraint r
WHERE r.conrelid = '16485' AND r.contype = 'f' ORDER BY 1
In this case, 16485 is the oid of the table I'm looking at - you can get that one by just casting your tablename to regclass like:
WHERE r.conrelid = 'mytable'::regclass
Schema-qualify the table name if it's n...
Can't find Request.GetOwinContext
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You may need to add the NuGet package Microsoft.Owin.Host.SystemWeb in order to do this:
HttpContext.Current.GetOwinContext().GetUserManager<ApplicationUserManager>();
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Difference between ObservableCollection and BindingList
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HTTP 404 Page Not Found in Web Api hosted in IIS 7.5
...bled after ASP.NET, you will need to manually register ASP.NET with IIS in order for your .NET application to work.
For Windows 7 and earlier:
Run the Command Prompt (cmd.exe) as an administrator.
Navigate to the appropriate .NET Framework location. (e.g. C:\Windows\Microsoft.NET\Framework64\v4.0...
How To fix white screen on app Start up?
... I know as an Android Developer, this is the only thing you need to set in order to hide the white screen on the start of the application.
Why are global variables evil? [closed]
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