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How to check if a specified key exists in a given S3 bucket using Java
..., Amazon will prevent you from checking for the presence of the key if you dont have ListBucket access. Just knowing whether a key is present or not, will also suffice for malicious users in some cases. Hence unless they have ListBucket access they will not be able to do so.
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In jQuery, how do I select an element by its name attribute?
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This should do it, all of this is in the documentation, which has a very similar example to this:
$("input[type='radio'][name='theme']").click(function() {
var value = $(this).val();
});
I should also note you have multiple identi...
How do I detect that an iOS app is running on a jailbroken phone?
...";
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath])
{
// do something useful
}
For hacked kernels, it's a little (lot) more involved.
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How to Implement Custom Table View Section Headers and Footers with Storyboard
...ection, call tableView:dequeueReusableHeaderFooterViewWithIdentifier:. You do not use a cell prototype with this API (it's either a NIB-based view or a programmatically created view), but this is the new API for dequeued headers and footers.
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How to know user has clicked “X” or the “Close” button?
... if (string.Equals((sender as Button).Name, @"CloseButton"))
// Do something proper to CloseButton.
else
// Then assume that X has been clicked and act accordingly.
}
Otherwise, I have never ever needed to differentiate whether X or CloseButton was clicked, as I wanted to pe...
Why doesn't Dictionary have AddRange?
...ty well:
because no one ever designed, specified, implemented, tested, documented and shipped that feature. - @Gabe Moothart
As to why? Well, likely because the behavior of merging dictionaries can't be reasoned about in a manner that fits with the Framework guidelines.
AddRange doesn't exist...
How do you turn off version control in android studio?
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To disable VCS in Android Studio on a Mac do the following:
Android Studio > Preferences...
In the Preferences window, select Version Control and under Directory choose VCS dropdown to be <none>
Don't forget to click "Apply" in the general Preferences...
Getting number of elements in an iterator in Python
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No. It's not possible.
Example:
import random
def gen(n):
for i in xrange(n):
if random.randint(0, 1) == 0:
yield i
iterator = gen(10)
Length of iterator is unknown until you iterate through it.
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UDP vs TCP, how much faster is it? [closed]
... of TCP that acknowledges a set of packets, calculated by using the TCP window size and round-trip time (RTT).
For more information, I recommend the simple, but very comprehensible Skullbox explanation (TCP vs. UDP)
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How do I undo 'git add' before commit?
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You can undo git add before commit with
git reset <file>
which will remove it from the current index (the "about to be committed" list) without changing anything else.
You can use
git reset
without any file name to unstage all ...