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Vagrant's port forwarding not working [closed]
...p://localhost:4567/' from your host machine. Curl might give you a better error message than Safari.
I'd check that there are no firewalls set up restricting access to port 80. The default Vagrant VM (Ubuntu) doesn't come with a firewall set up, but you said you're using something else, so it mig...
How to add an object to an array
...case-sensitive. Calling new array() and new object() will throw a ReferenceError since they don't exist.
It's better to avoid new Array() due to its error-prone behavior.
Instead, assign the new array with = [val1, val2, val_n]. For objects, use = {}.
There are many ways when it comes to extending ...
Default parameters with C++ constructors [closed]
...se your ctor logic should be as minimal as possible. How do you deal with error handling in the ctor, should somebody pass in an argument that doesn't make any sense? You can either throw an exception, which is bad news unless all of your callers are prepared t
How to avoid java.util.ConcurrentModificationException when iterating through and removing elements
...oop in the normal way, the java.util.ConcurrentModificationException is an error related to the elements that are accessed.
So try:
for(int i = 0; i < list.size(); i++){
lista.get(i).action();
}
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Check if a class has a member function of a given signature
...raits>
// Primary template with a static assertion
// for a meaningful error message
// if it ever gets instantiated.
// We could leave it undefined if we didn't care.
template<typename, typename T>
struct has_serialize {
static_assert(
std::integral_constant<T, false>::...
How can I check for an empty/undefined/null string in JavaScript?
...ant value and the variable. This way when you test your code you'll see an error (Invalid lef-hand side in assignment). You can also use something like JSHint to disallow assignment in conditions and be warned when you write one.
– florian
Sep 23 '13 at 9:58
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How to rollback a specific migration?
... (This corrected command was added AFTER all the comments pointing out the error in the original post)
rake db:migrate VERSION=20100905201547
In order to rollback ONLY ONE specific migration (OUT OF ORDER) use:
rake db:migrate:down VERSION=20100905201547
Note that this will NOT rollback any in...
What does mvn install in maven exactly do
...endencies will have to be resolved for the project to be built without any errors, and mvn install is one utility that could download most of the dependencies.
Further, there are other utils within Maven like dependency:resolve which can be used separately in any specific cases. The build life cycl...
MySQL - UPDATE multiple rows with different values in one query
... Excuse my english sir, when i try to make an update mysql give me the error: # 1062 - Duplicate entry 'XXX' for key 'PRIMARY'. That does when I try to update a record with the same value it already had, is there any way to skip the update if the current value is the same as being updated?
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Better way to cast object to int
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I did find a point that wasn't really an error but perhaps simplified things too much so someone might think that. I've removed that sentence and added a link to authoritative documentation.
– Joel Coehoorn
Apr 13 '09 at 20:28...