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Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
...l
It is also including a similar sort of way: Array#dig and Hash#dig. So now this
city = params.fetch(:[], :country).try(:[], :state).try(:[], :city)
can be rewritten to
city = params.dig(:country, :state, :city)
Again, #dig is not replicating #try's behaviour. So be careful with returning v...
Setting action for back button in navigation controller
...indexOfObject:self]==NSNotFound) {
// back button was pressed. We know this is true because self is no longer
// in the navigation stack.
}
[super viewWillDisappear:animated];
}
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bootstrap modal removes scroll bar
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Added some more details. Better now?
– flup
Jul 31 '14 at 22:52
14
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foreach with index [duplicate]
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This can now get a bit shorter when using a C# 7 ValueTuple: foreach (var (x, i) in someCollection.Select((x, i) => (x, i)) ) { ... }
– FernAndr
Sep 17 '19 at 12:20
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How to make a background 20% transparent on Android
...w this procedure:
Given a transparency percentage, for example 20%, you know the opaque percentage value is 80% (this is 100-20=80)
The range for the alpha channel is 8 bits (2^8=256), meaning the range goes from 0 to 255.
Project the opaque percentage into the alpha range, that is, multiply the r...
Best way to create enum of strings?
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I don't know what you want to do, but this is how I actually translated your example code....
package test;
/**
* @author The Elite Gentleman
*
*/
public enum Strings {
STRING_ONE("ONE"),
STRING_TWO("TWO")
;
priv...
How do I best silence a warning about unused variables?
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C++17 now provides the [[maybe_unused]] attribute.
http://en.cppreference.com/w/cpp/language/attributes
Quite nice and standard.
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Open Facebook page from Android app?
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Thanks for this, helped me out greatly! Now if only there was a way to do it for twitter
– Evan R.
Jul 26 '12 at 4:08
3
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How do I measure the execution time of JavaScript code with callbacks?
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>I want to know how to measure the time taken by these db insert operations. --- console.timeEnd("dbsave") just outputs to console the timing. You can't use that further and is less flexible. If you need the actual timing value, like i...
Jquery live() vs delegate() [duplicate]
...rather than to the default document root. Wouldn't live() be better to use now since we can add the event context. Since delegate() calls live() internally. So I think 1 call less. Or am I wrong?
– PeeHaa
May 16 '11 at 17:55
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