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How to go back (ctrl+z) in vi/vim

In normal text editors [with all due respect to Vim] there is a shortcut Ctrl + Z when you have done something nasty and want to return to the previous version of the text. Like BACK button in Word. I wonder how can you achieve this behaviour in Vim. ...
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Setting HTTP headers

...is now: func saveHandler(w http.ResponseWriter, r *http.Request) { // allow cross domain AJAX requests w.Header().Set("Access-Control-Allow-Origin", "*") } Maybe this will help someone as caffeine deprived as myself sometime :) ...
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`require': no such file to load — mkmf (LoadError)

I was trying to install rails on Ubuntu Natty Narwhal 11.04, using ruby1.9.1. 10 Answers ...
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How do I join two lists in Java?

... Gawd, that's a thing in Java 8? Technically you win I guess, but that's a heck of a long line :-) – Robert Atkins Sep 9 '13 at 20:03 4 ...
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When should I use Arrow functions in ECMAScript 6?

... A while ago our team migrated all its code (a mid-sized AngularJS app) to JavaScript compiled using Traceur Babel. I'm now using the following rule of thumb for functions in ES6 and beyond: Use function in the global scope and for Object.prototype prope...
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Host 'xxx.xx.xxx.xxx' is not allowed to connect to this MySQL server

...CREATE USER 'monty'@'localhost' IDENTIFIED BY 'some_pass'; mysql> GRANT ALL PRIVILEGES ON *.* TO 'monty'@'localhost' -> WITH GRANT OPTION; mysql> CREATE USER 'monty'@'%' IDENTIFIED BY 'some_pass'; mysql> GRANT ALL PRIVILEGES ON *.* TO 'monty'@'%' -> WITH GRANT OPTION; ...
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Set selected option of select box

... code into a $(document).ready: $(function() { $("#gate").val('gateway_2'); }); share | improve this answer | follow | ...
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How to get subarray from array?

... What K_7 said; most especially, monkey-patching the Builtins (Object, Array, Promise, etc) is very naughty. See the famous example of MooTools forcing a rename of the proposed native Array.prototype.contains to Array.prototype.incl...
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How to execute PHP code from the command line?

...e command line: -r <code> Run PHP <code> without using script tags <?..?> -R <code> Run PHP <code> for every input line You can use php's -r switch as such: php -r 'echo function_exists("foo") ? "yes" : "no";' The above PHP command above should outpu...
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How to build query string with Javascript

...the input is the form element (DOM Element) It doesn't handle fields that allow multiple selection. share | improve this answer | follow | ...