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How to check if a file exists in Documents folder?

...th: method. It's often better to just try to open a file and deal with the error if the file does not exist. NSFileManager Class Reference Note: Attempting to predicate behavior based on the current state of the file system or a particular file on the file system is not recommended. Doing so can ca...
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How does variable assignment work in JavaScript?

So I was playing around the other day just to see exactly how mass assignment works in JavaScript. 7 Answers ...
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How to pass values between Fragments

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Loaded nib but the 'view' outlet was not set

...s://stackoverflow.com/a/6395750/939501 were true but still it was throwing error, reason was I created a View class with name ABCView and then deleted it later I added a view controller as ABCViewController so somehow it was referring to old ABCView in new view controller, I had to delete the ABCVie...
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How do I install an R package from source?

...packages("/tmp/shiny_0.13.1.tar.gz", repos=NULL, type="source") i get this error: -ksh: syntax error: `(' unexpected – iaav Jul 11 '16 at 20:55 ...
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git rebase: “error: cannot stat 'file': Permission denied”

... I've only ever seen this error on Windows and what it seems to mean is that something blocked git from modifying a file at the moment when it tried to a apply a patch. Windows tends to give processes exclusive access to files when it shouldn't reall...
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Visual Studio warning: “Some of the properties associated with the solution could not be read”

...his warning. The solution (one web app, one class project) builds without errors. 15 Answers ...
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Possible heap pollution via varargs parameter

...ssign incorrect values into the list and the compiler will not trigger any error. For example, if T is a String then the following code will compile without error but will fail at runtime: // First, strip away the array type (arrays allow this kind of upcasting) Object[] objectArray = bar; // Next...
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How to list active / open connections in Oracle?

... Error starting at line 1 in command: select * from FROM v$session Error at Command Line:1 Column:14 Error report: SQL Error: ORA-00903: invalid table name 00903. 00000 - "invalid table name" *Cause: *Action: ...
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Margin on child element moves parent element

I have a div ( parent ) that contains another div ( child ). Parent is the first element in body with no particular CSS style. When I set ...