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What is the performance of Objects/Arrays in JavaScript? (specifically for Google V8)

Performance associated with Arrays and Objects in JavaScript (especially Google V8) would be very interesting to document. I find no comprehensive article on this topic anywhere on the Internet. ...
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Meaning of $? (dollar question mark) in shell scripts

.../drush status bootstrap | grep -q $(vendor/bin/drush php-eval 'if (function_exists("t")) echo t("Successful");') &> /dev/null;. If I had to put that in a single line if [ ... ] it would be terribly unreadable. I plan to store the output of that line to a variable so I can just say if [ $drupa...
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Which comment style should I use in batch files?

...his is a comment, the caret is ignored^ echo This line is printed REM This_is_a_comment_the_caret_appends_the_next_line^ echo This line is part of the remark REM followed by some characters .:\/= works a bit different, it doesn't comment an ampersand, so you can use it as inline comment. echo Fi...
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Best approach to converting Boolean object to string in java

...irst test for null and later invoke toString() method on your object. Calling Boolean.toString(b) will invoke public static String toString(boolean b) { return b ? "true" : "false"; } which is little slower than b.toString() since JVM needs to first unbox Boolean to boolean which will be...
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How does the keyword “use” work in PHP and can I import classes with it?

...ou want to access those class objects then you can do the following: $smtp_mailer = new SMTPMailer; $mailgun_mailer = new MailgunMailer; It will reference the original class. Some may get confused that then of there are not Similar class names then there is no use of use keyword. Well, you can u...
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Go Unpacking Array As Arguments

...sum as many things as you'd like. Notice the important ... after when you call the my_func function. Running example: http://ideone.com/8htWfx share | improve this answer | ...
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Struggling with NSNumberFormatter in Swift for currency

...string(from: price) // "$123.44" formatter.locale = Locale(identifier: "es_CL") formatter.string(from: price) // $123" formatter.locale = Locale(identifier: "es_ES") formatter.string(from: price) // "123,44 €" Here's the old example on how to use it on Swift 2. let price = 123.436 let form...
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How to convert array to SimpleXML

...ent('<?xml version="1.0"?><data></data>'); // function call to convert array to xml array_to_xml($data,$xml_data); //saving generated xml file; $result = $xml_data->asXML('/file/path/name.xml'); ?> Documentation on SimpleXMLElement::asXML used in this snippet ...
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nginx upload client_max_body_size issue

... Thanks, that actually explains a lot. Certainly looks like Expect is the way to go for large requests. – krukid Jan 21 '13 at 15:55 ...
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Removing all empty elements from a hash / YAML?

How would I go about removing all empty elements (empty list items) from a nested Hash or YAML file? 20 Answers ...