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What are JavaScript's builtin strings?
...with that funny snippet. I have written that piece of code just for fun in order to send it to my wife on February 14 :) Having only Chrome installed on the laptop I had no options to check how it works in Firefox and IE. Moreover, I haven't really expected that toString() representation of build-in...
Where can I learn how to write C code to speed up slow R functions? [closed]
...:
SEXP foobar(){
SEXP ab;
PROTECT(ab = allocVector(STRSXP, 2));
SET_STRING_ELT( ab, 0, mkChar("foo") );
SET_STRING_ELT( ab, 1, mkChar("bar") );
UNPROTECT(1);
}
Using Rcpp, you can write the same function as:
SEXP foobar(){
return Rcpp::CharacterVector::create( "foo", "bar" ) ;
}
...
Why can't C++ be parsed with a LR(1) parser?
... other information (e.g., knowledge of the type of x) must collect both in order to decide later what to do. Thus a grammar must allow this. And that makes the grammar ambiguous.
Thus pure LR parsing can't handle this. Nor can many other widely available parser generators, such as Antlr, JavaCC, ...
Thread Safety in Python's dictionary
...mic operations, there are corner cases where they aren’t atomic (e.g. if __hash__ or __eq__ are implemented as Python methods) and their atomicity should not be relied upon. Neither should you rely on atomic variable assignment (since this in turn depends on dictionaries).
Use the Queue module's Q...
Is there a way to detect if a browser window is not currently active?
... too. Think about the same case as above, or a user watching a video.
In order to improve the imperfect behaviors described above, I use a combination of the 3 methods: W3C Visibility API, then focus/blur and user activity methods in order to reduce the false positive rate. This allows to manage t...
Test if a vector contains a given element
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Maybe I come a little late. which(v, 'b'). Mind the order of the arguments.
– Niklas Mertsch
Dec 19 '18 at 19:40
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How to exclude a directory in find . command
... delete? For -delete to work, find needs to traverse the directory in DFS order, since -deletewill first delete the leaves, then the parents of the leaves, etc... But for specifying -prune to make sense, find needs to hit a directory and stop descending it, which clearly makes no sense with -depth ...
What is the best way to trigger onchange event in react js
... have a value setter in their constructor
if ( inputTypes.indexOf(node.__proto__.constructor) >-1 ) {
const setValue = Object.getOwnPropertyDescriptor(node.__proto__, 'value').set;
const event = new Event('input', { bubbles: true });
setValue.call(node, value);
...
Unable to locate tools.jar
...
Add JAVA_HOME and the /bin directory to your path. You realize that this answer is two years old, right?
– duffymo
Jul 23 '13 at 12:52
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How to stop unwanted UIButton animation on title change?
...
This works for custom buttons:
[UIView setAnimationsEnabled:NO];
[_button setTitle:@"title" forState:UIControlStateNormal];
[UIView setAnimationsEnabled:YES];
For system buttons you need to add this before re-enabling animations (thank you @Klaas):
[_button layoutIfNeeded];
...