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Memoization in Haskell?
...tion (fix)
Let's define f, but make it use 'open recursion' rather than call itself directly.
f :: (Int -> Int) -> Int -> Int
f mf 0 = 0
f mf n = max n $ mf (n `div` 2) +
mf (n `div` 3) +
mf (n `div` 4)
You can get an unmemoized f by using fix f
This...
form serialize javascript (no framework)
Wondering is there a function in javascript without jquery or any framework that allows me to serialize the form and access the serialized version?
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IntelliJ show JavaDocs tooltip on mouse over
...T: For IntelliJ Ultimate 2017.2, aka IntelliJ IDEA 2017.2.3, there are actually two options:
In Editor > General > Other (section) > Show quick documentation on mouse move - delay 500 ms
Select this check box to show quick documentation for the symbol at caret. The quick documentation p...
Generate all permutations of a list without adjacent equal elements
...is greedy algorithm returns optimal solutions, by the following logic. We call a prefix (partial solution) safe if it extends to an optimal solution. Clearly the empty prefix is safe, and if a safe prefix is a whole solution then that solution is optimal. It suffices to show inductively that each gr...
How to get the instance id from within an ec2 instance?
...:\\1:'`"
You may also use curl instead of wget, depending on what is installed on your platform.
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How to manually expand a special variable (ex: ~ tilde) in bash
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Using eval is a horrible suggestion, it's really bad that it gets so many upvotes. You will run into all sorts of problems when the variable's value contains shell meta characters.
– user2719058
Aug 31 '14 at 19:47
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Case insensitive Query with Spring CrudRepository
...meContainingIgnoreCase(String name);
}
See documentation for a list of all supported keywords inside method names.
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Command to escape a string in bash
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In Bash:
printf "%q" "hello\world" | someprog
for example:
printf "%q" "hello\world"
hello\\world
This could be used through variables too:
printf -v var "%q\n" "hello\world"
echo "$var"
hello\\world
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Cannot convert lambda expression to type 'string' because it is not a delegate type [duplicate]
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This has to be the stupidest thing ever. Giving you a totally misleading error message instead of clearly stating that you miss a reference. Someone cannot program at microsoft. Well, thanks for the fix
– Liquid Core
Oct 24 '16 at 10:19
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How can Perl's print add a newline by default?
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Perl 6 has the say function that automatically appends \n.
You can also use say in Perl 5.10 or 5.12 if you add
use feature qw(say);
to the beginning of your program. Or you can use Modern::Perl to get this and other features.
See perldoc feature for more detai...