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Best way to merge two maps and sum the values of same key?
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The shortest answer I know of that uses only the standard library is
map1 ++ map2.map{ case (k,v) => k -> (v + map1.getOrElse(k,0)) }
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How to convert a LocalDate to an Instant?
...for you automatically, so you must provide it.
LocalDate date = LocalDate.now();
Instant instant = date.atStartOfDay(ZoneId.systemDefault()).toInstant();
This example uses the default time-zone of the JVM - ZoneId.systemDefault() - to perform the conversion. See here for a longer answer to a rela...
Google Guice vs. PicoContainer for Dependency Injection
...scourage setter injection but other than that, your classes don't need to know about Pico. It's only the wiring that needs to know (true for all DI frameworks).
Guice - Guice now supports the standard JSR 330 annotations, so you do not need Guice specific annotations in your code anymore. Spring als...
Get the current time in C
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I know it's probably a bit late and you have likely figured it out by now, but you would use the strptime function in time.h to convert from char * to struct tm
– KingRadical
Nov 5 '13 at 1...
What's the $unwind operator in MongoDB?
...s.funded_year"
} }
])
If we look at the funding_rounds array, we know that for each funding_rounds, there is a raised_amount and a funded_year field. So, unwind will for each one of the documents that are elements of the funding_rounds array produce an output document. Now, in this example,...
What to do Regular expression pattern doesn't match anywhere in string?
... # ...except for the />, which is grabbed here
)/xgm;
# Now each member of @input_tags is something like <input type="hidden" name="SaveRequired" value="False" />
foreach my $input_tag (@input_tags)
{
my $hash_ref = {};
# Now extract each of the fields one at a time.
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List passed by ref - help me explain this behaviour
...asses a reference to the local-variable myRef (as declared in TestMethod); now, if you reassign the parameter inside ChangeList you are also reassigning the variable inside TestMethod.
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Setting table row height
... seriously? I thought this would always have worked. it certainly does now. anyway this is the solution I found to be best since the way table cells work is to expand to their content. so height in a td is effectively min-height, which in this case is actually what you want
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JUnit 4 Test Suites
...ice.class,
testMyBackend.class,
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})
public class AllTests {}
Now you can run this in a couple different ways:
right-click and run in Eclipse as Junit test
create a runable Java Application; Main class='org.junit.runner.JUnitCore' and Args='my.package.tests.AllTests'
run from the comm...
Origin null is not allowed by Access-Control-Allow-Origin
... I'm not being able to add this parameter under Windows 8..., anybody who knows how to do it?...
– Morty
May 22 '14 at 20:32
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