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Factory pattern in C#: How to ensure an object instance can only be created by a factory class?
... make sure any instance of this class will have a valid internal state. In order to achieve this I will need to perform some check before creating an object, probably in its constructor. This is all okay until I decide I want to make this check be a part of the business logic. So, how can I arrange ...
String.equals versus == [duplicate]
...g's equals() method:
It compares the Strings character by character, in order to come to a conclusion that they are indeed equal.
That's how the String equals method behaves. So datos[0].equals(usuario) will return true, because it performs a logical comparison.
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Array vs. Object efficiency in JavaScript
...If you need keys (numbers or strings), use an object. If you just need an (ordered) list, use arrays. Period. Performance doesn't enter the discussion. If performance is crucial and you could live with your keys either way, try which one works better for you.
– deceze♦
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Best way to store a key=>value array in JavaScript?
... But perhaps OP wanted an array since objects wont keep the order of items consistently across browser implementations?
– trainoasis
Apr 22 at 9:31
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Split data frame string column into multiple columns
...oses it into 2 vectors with a single value in each. paste0 is just used in order to create the column names, it is not used on the values. On the LHS of the equation are the column names, on the RHS is the split + transpose operation on the column. := stands for "assign in place", hence you don't se...
How to call Stored Procedure in Entity Framework 6 (Code-First)?
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This syntax requires no modification to the order of the SProc's Parameters, in other words Ordinal Positioning.
– GoldBishop
Oct 16 '15 at 12:52
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The Guava library: What are its most useful and/or hidden features? [closed]
...g collection mapped to a key and creating and adding it if it isn't there.
Ordering is great for building Comparators that behave just how you want.
Maps.uniqueIndex and Multimaps.index: these methods take an Iterable and a Function and build an ImmutableMap or ImmutableListMultimap that indexes th...
Combining multiple commits before pushing in Git [duplicate]
...and will open up an editor, where you can just replace pick with squash in order to remove/merge them into one
git rebase -i HEAD~4
where, 4 is the number of commits you want to squash into one. This is explained here as well.
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java.util.regex - importance of Pattern.compile()?
...d reset a Matcher object that is only ever used by one thread at a time in order to reduce allocations.
– AndrewF
Jul 3 '19 at 20:40
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Check if application is on its first run [duplicate]
...ever saved a boolean with that key or the user has cleared the app data in order to force a 'first run' scenario). If this isn't the first run then the line prefs.edit().putBoolean("firstrun", false).commit(); will have been executed and therefore prefs.getBoolean("firstrun", true) will actually ret...