大约有 47,000 项符合查询结果（耗时：0.0397秒） [XML]
What does |= (single pipe equal) and &=(single ampersand equal) mean
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edited Dec 24 '19 at 0:20
djeikyb
3,87233 gold badges3030 silver badges3737 bronze badges
answered ...
What does “atomic” mean in programming?
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edited Aug 18 '18 at 20:39
Basil Bourque
186k5757 gold badges571571 silver badges804804 bronze badges
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Join strings with a delimiter only if strings are not null or empty
...ple:
[...].filter(x => typeof x === 'string' && x.length > 0)
will only keep non-empty strings in the list.
--
(obsolete jquery answer)
var address = "foo";
var city;
var state = "bar";
var zip;
text = $.grep([address, city, state, zip], Boolean).join(", "); // foo, bar
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Getting the IP address of the current machine using Java
...new DatagramSocket()){
socket.connect(InetAddress.getByName("8.8.8.8"), 10002);
ip = socket.getLocalAddress().getHostAddress();
}
This way works well when there are multiple network interfaces. It always returns the preferred outbound IP. The destination 8.8.8.8 is not needed to be reachable. ...
Code Golf: Collatz Conjecture
Inspired by http://xkcd.com/710/ here is a code golf for it.
70 Answers
70
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How to initialize a vector in C++ [duplicate]
...is with an array:
int vv[2] = { 12,43 };
std::vector<int> v(&vv[0], &vv[0]+2);
Or, for the case of assignment to an existing vector:
int vv[2] = { 12,43 };
v.assign(&vv[0], &vv[0]+2);
Like James Kanze suggested, it's more robust to have functions that give you the beginni...
Append an object to a list in R in amortized constant time, O(1)?
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R>
That works on vectors too, so do I get the bonus points?
Edit (2015-Feb-01): This post is coming up on its fifth birthday. Some kind readers keep repeating any shortcomings with it, so by all means also see some of the comments below. One suggestion for list types:
newlist <- list(ol...
How do I convert an integer to binary in JavaScript?
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function dec2bin(dec){
return (dec >>> 0).toString(2);
}
dec2bin(1); // 1
dec2bin(-1); // 11111111111111111111111111111111
dec2bin(256); // 100000000
dec2bin(-256); // 11111111111111111111111100000000
You can use Number.toString(2) function, but it has ...
std::function vs template
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answered Feb 3 '13 at 22:50
Andy ProwlAndy Prowl
111k1818 gold badges348348 silver badges430430 bronze badges
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Remove first 4 characters of a string with PHP
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edited Nov 26 '10 at 15:23
answered Nov 26 '10 at 15:16
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