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How to find keys of a hash?
I know in javascript Objects double as hashes but i have been unable to find a built in function to get the keys
9 Answers...
How do I sort a dictionary by value?
...ring field and a numeric field. The string field is unique, so that is the key of the dictionary.
34 Answers
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Didn't Java once have a Pair class? [duplicate]
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There is no Pair in the standard framework, but the Apache Commons Lang, which comes quite close to “standard”, has a Pair.
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What's the opposite of head? I want all but the first N lines of a file
Given a text file of unknown length, how can I read, for example all but the first 2 lines of the file? I know tail will give me the last N lines, but I don't know what N is ahead of time.
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What key shortcuts are to comment and uncomment code?
... C (comment) and Ctrl + E + U (uncomment) in older versions, or Ctrl + K + C and Ctrl + K + U .
7 Answers
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How do I deal with certificates using cURL while trying to access an HTTPS url?
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This error is related to a missing package: ca-certificates. Install it.
In Ubuntu Linux (and similar distro):
# apt-get install ca-certificates
In CygWin via Apt-Cyg
# apt-cyg install ca-certificates
In Arch Linux (Raspberry Pi)
# pacman -S ca-certificat...
How to get number of entries in a Lua table?
Sounds like a "let me google it for you" question, but somehow I can't find an answer. The Lua # operator only counts entries with integer keys, and so does table.getn :
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Define all functions in one .R file, call them from another .R file. How, if possible?
... by source("xyz.R") (assuming that both these files are in your current working directory.
If abc.R is:
fooABC <- function(x) {
k <- x+1
return(k)
}
and xyz.R is:
fooXYZ <- function(x) {
k <- fooABC(x)+1
return(k)
}
then this will work:
> source("abc.R")
> s...
Code snippet or shortcut to create a constructor in Visual Studio
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Type "ctor" + TAB + TAB (hit the Tab key twice). This will create the default constructor for the class you are in:
public MyClass()
{
}
It seems that in some cases you will have to press TAB twice.
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How do I clear/delete the current line in terminal?
...m using terminal and typing in a line of text for a command, is there a hotkey or any way to clear/delete that line?
14 Ans...