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Only mkdir if it does not exist [duplicate]
...ld send a message to the user and ask for input, abort, or do other things if [[ -e dir && ! -d dir ]] is valid.
– konsolebox
Sep 4 '13 at 22:17
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Why is === faster than == in PHP?
...uality operator == coerces, or converts, the data type temporarily to see if it’s equal to the other operand, whereas === (the identity operator) doesn’t need to do any converting whatsoever and thus less work is done, which makes it faster.
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Truncate number to two decimal places without rounding
... happen with floating point values (and on the other side of the spectrum, if the number happens to be 15, sounds like the OP wants 15.00).
– T.J. Crowder
Nov 15 '10 at 17:38
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Redirecting to previous page after authentication in node.js using passport.js
.....then I redirect to /login
auth.restrict = function(req, res, next){
if (!req.session.userid) {
req.session.redirectTo = '/account';
res.redirect('/login');
} else {
next();
}
};
Then in routes.login.post I do the following:
var redirectTo = req.session.redir...
android EditText - finished typing event
...ean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_ACTION_SEARCH ||
actionId == EditorInfo.IME_ACTION_DONE ||
event != null &&
event.getAction() == KeyEvent.ACTION_DOWN &&am...
AngularJS ngClass conditional
...s truthy or falsey, a bit similar to Javascript expressions but with some differences, you can read about here.
If your conditional is too complex, then you can use a function that returns truthy or falsey, as you did in your third attempt.
Just to complement: You can also use logical operators to ...
How do you test to see if a double is equal to NaN?
I have a double in Java and I want to check if it is NaN .
What is the best way to do this?
7 Answers
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What is duck typing?
...you don't need a type in order to invoke an existing method on an object - if a method is defined on it, you can invoke it.
The name comes from the phrase "If it looks like a duck and quacks like a duck, it's a duck".
Wikipedia has much more information.
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Differences between C++ string == and compare()?
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Returns: lhs.compare(rhs) == 0.
Seems like there isn't much of a difference!
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How do you handle multiple submit buttons in ASP.NET MVC Framework?
... = controllerContext.Controller.ValueProvider.GetValue(keyValue);
if (value != null)
{
controllerContext.Controller.ControllerContext.RouteData.Values[Name] = Argument;
isValidName = true;
}
return isValidName;
}
}
razor:
<form acti...