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How to validate an email address in JavaScript
...hat everything is 100% perfect for two main reasons: 1. It would take more time than it would be worth to write the logic and 2. There will always be an edge case where bad data could get submitted. The reason we validate is to encourage proper data submission and prevent mistakes.
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How to format a UTC date as a `YYYY-MM-DD hh:mm:ss` string using NodeJS?
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Note that by removing the time zone, it now represents a different moment in time in every time zone with a different offset.
– RobG
Jun 7 '16 at 13:01
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How to remove elements from a generic list while iterating over it?
...little test for performance and it turned out that RemoveAll() takes three times as much time as the backwards for loop. So I am definitely sticking with the loop, at least in sections where it matters.
– Crusha K. Rool
Nov 15 '16 at 1:40
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What is the Java string pool and how is “s” different from new String(“s”)? [duplicate]
...e immutable. Interning strings
makes some string processing tasks
more time- or space-efficient at the
cost of requiring more time when the
string is created or interned. The
distinct values are stored in a string
intern pool.
Basically, a string intern pool allows a runtime to save me...
Remove characters except digits from string using Python?
...le.
Back to 2.*, the performance difference is impressive...:
$ python -mtimeit -s'import string; all=string.maketrans("", ""); nodig=all.translate(all, string.digits); x="aaa12333bb445bb54b5b52"' 'x.translate(all, nodig)'
1000000 loops, best of 3: 1.04 usec per loop
$ python -mtimeit -s'import re...
Co-variant array conversion from x to y may cause run-time exception
...What it means is this
Control[] controls = new LinkLabel[10]; // compile time legal
controls[0] = new TextBox(); // compile time legal, runtime exception
And in more general terms
string[] array = new string[10];
object[] objs = array; // legal at compile time
objs[0] = new Foo(); // again lega...
Check if a string contains a string in C++
...lgorithm is the slowest possible. My guess would be that it takes a lot of time to create those iterators.
The code that i used to time the whole thing is
#include <string>
#include <cstring>
#include <iostream>
#include <algorithm>
#include <random>
#include <chro...
How to send an email with Gmail as provider using Python?
...to an SMTP server by telnet and sent EHLO by typo. After I tried HELO many times but the response was different. It took hours to figure out that EHLO is actually a command that SMTP understand and I did the typo.
– Shiplu Mokaddim
Jan 26 '17 at 11:03
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Computational complexity of Fibonacci Sequence
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You model the time function to calculate Fib(n) as sum of time to calculate Fib(n-1) plus the time to calculate Fib(n-2) plus the time to add them together (O(1)). This is assuming that repeated evaluations of the same Fib(n) take the sam...
urlencode vs rawurlencode?
...rocess of how to find out this sort of thing on your own in the future any time you want. Bear with me, there'll be a lot of C source code you can skim over (I explain it). If you want to brush up on some C, a good place to start is our SO wiki.
Download the source (or use http://lxr.php.net/ to br...