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How to sort a list in Scala by two fields?
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@SachinK: you have to create your own Ordering for Row class and use it with sorted method like this: rows.sorted(customOrdering). You could also use custom Ordering for Tuple2 like this: rows.sortBy(r => (r.lastName, r.firstName))( Ordering.Tuple2(Ordering.St...
Why does Java's hashCode() in String use 31 as a multiplier?
...cation to be key.hashCode() ^ value.hashCode() despite it is not even an unordered pair, as key and value have entirely different meaning. Yes, that implies that Map.of(42, 42).hashCode() or Map.of("foo", "foo", "bar", "bar").hashCode(), etc, are predictably zero. So don’t use maps as keys for oth...
The order of keys in dictionaries
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You could use OrderedDict (requires Python 2.7) or higher.
Also, note that OrderedDict({'a': 1, 'b':2, 'c':3}) won't work since the dict you create with {...} has already forgotten the order of the elements. Instead, you want to use Order...
What's the difference between comma separated joins and join on syntax in MySQL? [duplicate]
...same query. If we do mix them, we need to be aware of a difference in the order of precedence.
excerpt from MySQL Reference Manual
https://dev.mysql.com/doc/refman/5.6/en/join.html
INNER JOIN and , (comma) are semantically equivalent in the absence of a join condition: both produce a Cartesian pro...
Saving an Object (Data persistence)
...advantage is you don't need to know how many object instances are saved in order to load them back later (although doing so without that information is possible, it requires some slightly specialized code). See the answers to the related question Saving and loading multiple objects in pickle file? f...
How to remove the focus from a TextBox in WinForms?
...pecific control or SelectNextControl to select the next control in the tab order.
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Could not establish trust relationship for SSL/TLS secure channel — SOAP
...w machine is not a server -- it is a desktop running my app, which gathers order info and uploads via the SOAP service 3) Yes, we can browse to it. 4) This is new to me: machine level proxy?
– Rob Schripsema
Mar 31 '09 at 22:21
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How to revert initial git commit?
... have already pushed to remote, you will need to force it to the remote in order to overwrite the previous initial commit:
git push --force origin
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How does Python 2 compare string and int? Why do lists compare as greater than numbers, and tuples g
...ython implementation detail: Objects of different types except numbers are ordered by their type names; objects of the same types that don’t support proper comparison are ordered by their address.
When you order two strings or two numeric types the ordering is done in the expected way (lexicogra...
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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