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Test if object implements interface

...ckListener, OnCheckedChangeListener { public static final String FIRST_RUN_ABOUT = "com.gosylvester.bestrides.firstrunabout"; public interface AboutDialogListener { void onFinishEditDialog(Boolean _Checked); } private AboutDialogListener adl; @Override public View onCreateView(LayoutInf...
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What is the difference between t.belongs_to and t.references in rails?

What is the difference between t.references and t.belongs_to ? Why are we having those two different words? It seems to me they do the same thing? Tried some Google search, but find no explanation. ...
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Django CharField vs TextField

...e found that using TextField by default can impact the portability of your app. There might not be a performance hit on Postgres, but Oracle will store it as a CLOB which has some annoyances, like not being able to use the field in WHERE statements. Just something to consider. –...
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Scala downwards or decreasing for loop?

... answered May 13 '14 at 21:54 LP_LP_ 92477 silver badges1919 bronze badges ...
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DataContractSerializer doesn't call my constructor?

...sible : when deserializing an object, the DataContractSerializer doesn't call the constructor ! 4 Answers ...
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How to Store Historical Data

...current, active record. So, let's say I have table FOO. Under my system, all active records will go in FOO, and all historical records will go in FOO_Hist. Many different fields in FOO can be updated by the user, so I want to keep an accurate account of everything updated. FOO_Hist holds the exa...
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Adding rounded corner and drop shadow to UICollectionViewCell

... Neither of these solutions worked for me. If you place all your subviews into the UICollectionViewCell content view, which you probably are, you can set the shadow on the cell's layer and the border on the contentView's layer to achieve both results. cell.contentView.layer.corne...
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Is there any way to git checkout previous branch?

... wow, I totally should have just tried it! figured - was a shell-ism, and that if the functionality was in git, it would be something different – Matt Briggs Aug 26 '11 at 16:17 ...
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How to get the difference between two arrays in JavaScript?

... The fastest way is the most obviously naive solution. I tested all of the proposed solutions for symmetric diff in this thread, and the winner is: function diff2(a, b) { var i, la = a.length, lb = b.length, res = []; if (!la) return b; else if (!lb) r...
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How to print the values of slices

... ¯\_(ツ)_/¯ If you find short solution please add it as an answer to this question. I’m betting that is what most people are looking for. – Pylinux Dec 7 '19 at 14:03 ...