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Test if string is a number in Ruby on Rails
...is_number? Method.
Create a helper method:
def is_number? string
true if Float(string) rescue false
end
And then call it like this:
my_string = '12.34'
is_number?( my_string )
# => true
Extend String Class.
If you want to be able to call is_number? directly on the string instead of pa...
Is a view faster than a simple query?
...I'm fairly certain that SQL Server uses some variant of a b-tree, I don't know the details. Nonetheless, the point holds.
Update 3: The question has come up about whether an Indexed View just uses an index placed on the underlying table. That is, to paraphrase: "an indexed view is just the equiva...
How can I make a clickable link in an NSAttributedString?
...xt = str;
Edit:
This is not directly about the question but just to clarify, UITextField and UILabel does not support opening URLs. If you want to use UILabel with links you can check TTTAttributedLabel.
Also you should set dataDetectorTypes value of your UITextView to UIDataDetectorTypeLink or...
How do I convert an NSString value to NSData?
...he NULL terminator
Following the comments, official documentation, and verifications, this answer was updated regarding the removal of an alleged NULL terminator:
As documented by dataUsingEncoding::
Return Value
The result of invoking dataUsingEncoding:allowLossyConversion: with NO as t...
How to split a large text file into smaller files with equal number of lines?
...le that I'd like to split into smaller files, also by number of lines. So if my file has around 2M lines, I'd like to split it up into 10 files that contain 200k lines, or 100 files that contain 20k lines (plus one file with the remainder; being evenly divisible doesn't matter).
...
常用Linux命令详解（持续更新） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...作，详细的命令参数请输入：shutdown -h 进行查看
shutdown now 关机命令
shutdown -r now 关机重启命令
3. 重新启动计算机的命令
reboot
用来重新启动系统，直接输入reboot即可
4. 新建用户的命令
useradd kedacom 新增一个kedacom...
HTML table td meaning
...
Yeah, table data. It doesn't make sense if you don't know about th, table header, since without it table cell would be a better one.
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Laravel redirect back to original destination after login
...irect the user to "/login"
// and stores the url being accessed on session
if (Auth::guest()) {
return redirect()->guest('login');
}
return $next($request);
On login action:
// redirect the user back to the intended page
// or defaultpage if there isn't one
if (Auth::attempt(['email' =>...
How to remove item from array by value? [duplicate]
...
This can be a global function or a method of a custom object, if you aren't allowed to add to native prototypes. It removes all of the items from the array that match any of the arguments.
Array.prototype.remove = function() {
var what, a = arguments, L = a.length, ax;
while (L...
How to execute a MySQL command from a shell script?
..."server-name" -u "root" "-pXXXXXXXX" "database-name" < "filename.sql"
If you use a space after -p it makes the mysql client prompt you interactively for the password, and then it interprets the next command argument as a database-name:
$ mysql -h "server-name" -u "root" -p "XXXXXXXX" "database...