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Is a Java hashmap search really O(1)?
...say, balanced trees, its behavior is probabilistic. In these cases its usually most helpful to talk about complexity in terms of the probability of a worst-case event occurring would be. For a hash map, that of course is the case of a collision with respect to how full the map happens to be. A co...
Adding two numbers concatenates them instead of calculating the sum
...asiest way to produce a number from a string is to prepend it with +:
var x = +y + +z;
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HTML5 form required attribute. Set custom validation message?
...ustomValidity works slightly differently to what I understood when I originally answered. If setCustomValidity is set to anything other than the empty string it will cause the field to be considered invalid; therefore you must clear it before testing validity, you can't just set it and forget.
Furt...
How can I generate a self-signed certificate with SubjectAltName using OpenSSL? [closed]
...I am generating the csr for the certificate, my guess is I have to use v3 extensions of OpenSSL x509.
I am using :
1 Answer...
How do I strip all spaces out of a string in PHP? [duplicate]
How can I strip / remove all spaces of a string in PHP?
4 Answers
4
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Send attachments with PHP Mail()?
...a convenient place in your project.
Include the main script file -- require_once('path/to/file/class.phpmailer.php');
Now, sending emails with attachments goes from being insanely difficult to incredibly easy:
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
$email = new PHP...
Akka or Reactor [closed]
...icipated, it's quite premature to provide a final answer to the question, except that Reactor is still in early stages, therefore not yet suitable for a comparison. So, let's wait and see how things evolve :-) Thanks, David
– David Riccitelli
May 21 '13 at 11:3...
Change old commit message on Git
...situation, a git rebase -i --abort might be needed to reset everything and allow you to try again)
As Dave Vogt mentions in the comments, git rebase --continue is for going to the next task in the rebasing process, after you've amended the first commit.
Also, Gregg Lind mentions in his answer the r...
二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...下二维码一共有40个尺寸。官方叫版本Version。Version 1是21 x 21的矩阵，Version 2是 25 x 25的矩阵，Version 3是29的尺寸，每增加一个version，就会增加4的尺寸，公式是：(V-1)*4 + 21（V是版本号） 最高Version 40，(40-1)*4+21 = 177，所以最高是177...
How do you uninstall all dependencies listed in package.json (NPM)?
...I have a package.json file defined in my application root and run npm install -g it will install all the dependencies defined in package.json, globablly.
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