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How to get the original value of an attribute in Rails
... original value that an ActiveRecord attribute (=the value that was loaded from the database)?
4 Answers
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How does java do modulus calculations with negative numbers?
... This doesn't work good if n is negative. If you user same example from Java 7 Lang Spec (Section 15.17.3): (-5) % (-3) = -2. Adding -3 will not work. You should add absolute value of n if you want to be sure that value is positive.
– partlov
Jul 2 '14 ...
How to return a value from a Form in C#?
...re, along with the values that needs to be filled in.
public class ResultFromFrmMain {
public DialogResult Result { get; set; }
public string Field1 { get; set; }
}
And on the form:
public static ResultFromFrmMain Execute() {
using (var f = new frmMain()) {
var resul...
Why is Cache-Control attribute sent in request header (client to server)?
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Cache-Control: no-cache is generally used in a request header (sent from web browser to server) to force validation of the resource in the intermediate proxies.
If the client doesn't send this request to the server, intermediate proxies will return a copy of the content if it is fresh (has no...
List of zeros in python [duplicate]
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$python 2.7.8
from timeit import timeit
import numpy
timeit("list(0 for i in xrange(0, 100000))", number=1000)
> 8.173301935195923
timeit("[0 for i in xrange(0, 100000)]", number=1000)
> 4.881675958633423
timeit("[0] * 100000", nu...
Difference between malloc and calloc?
...t calloc implementations under mainstream OSes will get known-zeroed pages from the OS (e.g. via POSIX mmap(MAP_ANONYMOUS) or Windows VirtualAlloc) so it doesn't need to write them in user-space. This is how normal malloc gets more pages from the OS as well; calloc just takes advantage of the OS's ...
What's the difference between setWebViewClient vs. setWebChromeClient?
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From the source code:
// Instance of WebViewClient that is the client callback.
private volatile WebViewClient mWebViewClient;
// Instance of WebChromeClient for handling all chrome functions.
private volatile WebChromeClien...
Python speed testing - Time Difference - milliseconds
...nWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead.
– Contango
Jul 21 at 20:02
add ...
Check if a String contains numbers Java
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To explain: .* means any character from 0 to infinite occurence, than the \\d+ (double backslash I think is just to escape the second backslash) and \d+ means a digit from 1 time to infinite.
– Giudark
Sep 29 '16 at 0:11
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What's wrong with this 1988 C code?
I'm trying to compile this piece of code from the book "The C Programming Language" (K & R). It is a bare-bones version of the UNIX program wc :
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