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Best way to merge two maps and sum the values of same key?
...(1 -> 109, 3 -> 300, 2 -> 20)
Specifically, the binary operator for Map[K, V] combines the keys of the maps, folding V's semigroup operator over any duplicate values. The standard semigroup for Int uses the addition operator, so you get the sum of values for each duplicate key.
Edit: A ...
What is the easiest way to remove the first character from a string?
...43"
asdf[0] = ''
p asdf
# >> "12,23,987,43"
I'm always looking for the fastest and most readable way of doing things:
require 'benchmark'
N = 1_000_000
puts RUBY_VERSION
STR = "[12,23,987,43"
Benchmark.bm(7) do |b|
b.report('[0]') { N.times { "[12,23,987,43"[0] = '' } }
b.report...
Explode PHP string by new line
...nd the stored data might not work anymore. So completely parse your data before storing it to remove any system dependent parts.
UPDATE
Andreas' comment made me realize that the 'Best Practice' solution I present here does not apply to the described use-case: the server's EOL (PHP) does not have a...
Why is GHC so large/big?
...ore changes (e.g. to Cabal and the package system, amongst other things) before this is really practical.
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How do I declare an array of weak references in Swift?
...eakObjectsHashTable. NSHashTable<ObjectType>.weakObjectsHashTable()
For Swift 3: NSHashTable<ObjectType>.weakObjects()
NSHashTable Class Reference
Available in OS X v10.5 and later.
Available in iOS 6.0 and later.
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Finding a branch point with Git?
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I was looking for the same thing, and I found this question. Thank you for asking it!
However, I found that the answers I see here don't seem to quite give the answer you asked for (or that I was looking for) -- they seem to give the G c...
awk without printing newline
...
printf "%s",whatever You forgot the comma. You can also extend with more variables and separate them with a comma.
– Hielke Walinga
Aug 7 '18 at 11:27
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How to check a radio button with jQuery?
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For versions of jQuery equal or above (>=) 1.6, use:
$("#radio_1").prop("checked", true);
For versions prior to (<) 1.6, use:
$("#radio_1").attr('checked', 'checked');
Tip: You may also want to call click() or cha...
What is the difference between String.Empty and “” (empty string)?
...ast as .Length == 0.
.Length == 0 is the fastest option, but .Empty makes for slightly cleaner code.
See the .NET specification for more information.
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PHP - how to best determine if the current invocation is from CLI or web server?
...PHP_SAPI.
Documentation can be found here: http://php.net/php_sapi_name
For example, to determine if PHP is being run from the CLI, you could use this function:
function isCommandLineInterface()
{
return (php_sapi_name() === 'cli');
}
...