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What's the opposite of chr() in Ruby?
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In Ruby up to and including the 1.8 series, the following will both produce 65 (for ASCII):
puts ?A
'A'[0]
The behavior has changed in Ruby 1.9, both of the above will produce "A" instead. The correct way to do this in Ruby 1.9 is:
'A'[0]...
What is the correct answer for cout
... a++ and a; the only ordering
constraints are that a++ be fully evaluated (including side effects)
before the first call to operator<<, and that the second a be fully
evaluated before the second call to operator<<. (There are also
causual ordering constraints: the second call to operato...
How to use timeit module
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Yes, it includes the list copy (which is very fast compared to the sort itself). If you don't copy though, the first pass sorts the list and remaining passed don't have to do any work. If you want to know the time just for the sor...
Using fonts with Rails asset pipeline
...recompile is also useless because "The default matcher for compiling files includes application.js, application.css and all non-JS/CSS files (this will include all image assets automatically) from app/assets folders" (see here)
– Eric L.
Nov 6 '13 at 13:26
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Is calculating an MD5 hash less CPU intensive than SHA family functions?
...pears "slow" here, it is fast enough for most purposes.
Note that OpenSSL includes a 32-bit implementation of SHA-512 which is quite faster than my code (but not as fast as the 64-bit SHA-512), because the OpenSSL implementation is in assembly and uses SSE2 registers, something which cannot be done...
CRON job to run on the last day of the month
...row's day of the month (you don't need the full power of date), such as:
#include <stdio.h>
#include <time.h>
int main (void) {
// Get today, somewhere around midday (no DST issues).
time_t noonish = time (0);
struct tm *localtm = localtime (&noonish);
localtm->...
Nested classes' scope?
...e class block; it does not extend to the code blocks of
methods – this includes generator expressions since they are
implemented using a function scope. This means that the following will
fail:
class A:
a = 42
b = list(a + i for i in range(10))
http://docs.pytho...
Securely storing environment variables in GAE with app.yaml
...an env_variables.yaml, e.g.,
env_variables:
SECRET: 'my_secret'
Then, include this env_variables.yaml in the app.yaml
includes:
- env_variables.yaml
Finally, add the env_variables.yaml to .gitignore, so that the secret variables won't exist in the repository.
In this case, the env_variabl...
What happens to a detached thread when main() exits?
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Consider the following code:
#include <iostream>
#include <string>
#include <thread>
#include <chrono>
void thread_fn() {
std::this_thread::sleep_for (std::chrono::seconds(1));
std::cout << "Inside thread function\n"; ...
Using Build Flavors - Structuring source folders and build.gradle correctly
...t code based on flavors, but have them in different modules so that we can include one module or the other based on the flavor, without having to mix code and resources in the same root project? Is that supported?
– Valerio Santinelli
Jun 26 '14 at 9:08
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