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Elegant way to check for missing packages and install them?
... @psql , Shine is right, since ">0" is "implicit" within the if condition. run this for to verify it: new.packages <- c(1,2) length(new.packages) if(length(new.packages)){print("hello!")}else{print("oh no!")}
– Andrea Cirillo
Jan 22 '16 at 7:57
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Extract hostname name from string
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Try:
npm install --save psl
Then with my "extractHostname" implementation run:
let psl = require('psl');
let url = 'http://www.youtube.com/watch?v=ClkQA2Lb_iE';
psl.get(extractHostname(url)); // returns youtube.com
I can't use an npm package, so below only tests extractHostname.
functio...
Jenkins on OS X: xcodebuild gives Code Sign error
...line (unsafe), e.g.:
security unlock-keychain -p mySecretPassword...
Obviously, putting this into a script compromises the security of that keychain, so often people setup an individual keychain with only the signing credentials to minimize such damage.
Typically in Terminal the keychain is alre...
Differences between utf8 and latin1
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UTF-8 is prepared for world domination, Latin1 isn't.
If you're trying to store non-Latin characters like Chinese, Japanese, Hebrew, Russian, etc using Latin1 encoding, then they will end up as mojibake. You may find the introductory text of this article use...
What is the Swift equivalent to Objective-C's “@synchronized”?
I've searched the Swift book, but can't find the Swift version of @synchronized. How do I do mutual exclusion in Swift?
21 ...
“Width equals height” constraint in Interface Builder
...m a view and release while the pointer is over the view. Select "Aspect Ratio". It will create a constraint where the first and second item is the view.
Before Xcode 5.1
You can't because the width/height editor lacks the fields to relate to another property or set the ratio:
Therefore, you c...
Executing elements inserted with .innerHTML
... 7. With help from SO, here's a script that does:
exec_body_scripts: function(body_el) {
// Finds and executes scripts in a newly added element's body.
// Needed since innerHTML does not run scripts.
//
// Argument body_el is an element in the dom.
function nodeName(elem, name) {
ret...
How do I find files with a path length greater than 260 characters in Windows?
...educe the path length, but unfortunately I can't work out which files are violating the path length restriction. The files that are copied are printed to the standard output (which I'm redirecting to a log file), but the error message is printed to the terminal, so I can't even work out approximate...
Execute another jar in a Java program
I had written several simple java applications named as A.jar, B.jar.
6 Answers
6
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What is a coroutine?
... coroutine. When the 'yield ' is encountered the current state of the function is saved and control is returned to the calling function. The calling function can then transfer execution back to the yielding function and its state will be restored to the point where the 'yield' was encountered and ex...