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Moving decimal places over in a double
...ass, we were asked in general what numbers can be exactly represented in a base.
For base=p1^n1*p2^n2... you can represent any N where N=n*p1^m1*p2^m2.
Let base=14=2^1*7^1... you can represent 1/7 1/14 1/28 1/49 but not 1/3
I know about financial software -- I converted Ticketmaster's financial r...
Swift performSelector:withObject:afterDelay: is unavailable [duplicate]
...2
let dispatchTime: dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, Int64(0.1 * Double(NSEC_PER_SEC)))
dispatch_after(dispatchTime, dispatch_get_main_queue(), {
// your function here
})
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How can I test if a letter in a string is uppercase or lowercase using JavaScript?
... something to console and in general not a reusable code snippet so I and (based on the votes on this answer) many other people naturally just skipped the answer. Therefore I think it's good to have this as quick copy-paste answer as opposed to the other answer.
– WebFreak001
...
How can I multiply and divide using only bit shifting and adding?
... = 21 * 5 (Same as initial expression)
(_2 means base 2)
As you can see, multiplication can be decomposed into adding and shifting and back again. This is also why multiplication takes longer than bit shifts or adding - it's O(n^2) rather than O(n) in the number of bits. R...
Print number of keys in Redis
...uild_id:b63575307aaffe0a
redis_mode:standalone
os:Linux 5.4.0-1017-aws x86_64
arch_bits:64
multiplexing_api:epoll
atomicvar_api:atomic-builtin
gcc_version:9.3.0
process_id:2854672
run_id:90a5246f10e0aeb6b02cc2765b485d841ffc924e
tcp_port:6379
uptime_in_seconds:2593097
uptime_in_days:30
hz:10
configur...
Unmangling the result of std::type_info::name
...
}
#endif
Usage:
#include <iostream>
#include "type.hpp"
struct Base { virtual ~Base() {} };
struct Derived : public Base { };
int main() {
Base* ptr_base = new Derived(); // Please use smart pointers in YOUR code!
std::cout << "Type of ptr_base: " << type(ptr_base...
How to document Ruby code?
... is easy to read the code comments, and it allows you to easily create web-based documentation for your project.
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Can CSS detect the number of children an element has?
... misleading. Note that, in CSS3, styles cannot be applied to a parent node based on the number of children it has. However, styles can be applied to the children nodes based on the number of siblings they have.
Original answer:
Incredibly, this is now possible purely in CSS3.
/* one item */
li:...
Calculate the date yesterday in JavaScript
...((new Date()).valueOf() - 1000*60*60*24);
this creates a new date object based on the value of "now" as an integer which represents the unix epoch in milliseconds subtracting one day.
Two days ago:
var twoDaysAgo = new Date((new Date()).valueOf() - 1000*60*60*24*2);
An hour ago:
var oneHourAg...
How do short URLs services work?
...question). They read the path part (here duSk8wK), which maps to their database. In the database, they find a description (sometimes), your name (sometimes) and the real URL. Then they issue a redirect, which is a HTTP 302 response and the target URL in the header.
This direct redirect is important...