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Local file access with JavaScript
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If the user selects a file via <input type="file">, you can read and process that file using the File API.
Reading or writing arbitrary files is not allowed by design. It's a violation of the sandbox. From Wikipedia -> Javascri...
What does the “map” method do in Ruby?
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map, along with select and each is one of Ruby's workhorses in my code.
It allows you to run an operation on each of your array's objects and return them all in the same place. An example would be to increment an array of numbers by one:
[...
How can I clear an HTML file input with JavaScript?
...it does seem reasonable to provide a simple mechanism for clearing already selecting output. I tried using an empty string but it did not work in all browsers, NULL worked in all the browsers I tried (Opera, Chrome, FF, IE11+ and Safari).
EDIT:
Please note that setting to NULL works on all browser...
TFS: How can you Undo Checkout of Unmodified files in a batch file
...containing' textbox "Tools.External" and assign a shortcut. For instance I selected Tools.ExternalCommand4 since my newly added undo command was the fourth one down. I then assigned shortcut keys Ctrl + Alt + U, Ctrl + Alt + U
– Mario
Feb 4 '13 at 22:52
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Pass a data.frame column name to a function
...(x[,column])
}
fun1(df, "B", max)
Alternatively, using [[ also works for selecting a single column at a time:
df <- data.frame(A=1:10, B=2:11, C=3:12)
fun1 <- function(x, column){
max(x[[column]])
}
fun1(df, "B")
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Bash variable scope
...do
var="abc"
echo $var | xsel -i -p # redirect stdin to the X primary selection
done
var=$(xsel -o -p) # redirect back to stdout
echo $var
EDIT:
Here, xsel is a requirement (install it).
Alternatively, you can use xclip:
xclip -i -selection clipboard
instead of
xsel -i -p
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Split output of command by columns using Bash?
...d> | while read a b; do echo $a; done
The first parameter to read, a, selects the first column, and if there is more, everything else will be put in b. As a result, you never need more variables than the number of your column +1.
So,
while read a b c d; do echo $c; done
will then output th...
Excel “External table is not in the expected format.”
...e same problem. which as resolved using these steps:
1.) Click File
2.) Select "save as"
3.) Click on drop down (Save as type)
4.) Select Excel 97-2003 Workbook
5.) Click on Save button
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How to close TCP and UDP ports via windows command line
...don't think that was being asked here. I believe the question is "how do I selectively close one active connection (socket) to the port my program is listening on?". The wording of the question is a bit off because a port number for the undesired inbound client connection is given and it was referr...
Unsupported major.minor version 52.0 [duplicate]
...s of your IDE. For example, in Eclipse go to menu Windows → Preferences, select Java, and expand it. Then select Compiler and change the compliance level to 1.7. I am sure this will work from there.
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