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How to call shell commands from Ruby

... This explanation is based on a commented Ruby script from a friend of mine. If you want to improve the script, feel free to update it at the link. First, note that when Ruby calls out to a shell, it typically calls /bin/sh, not Bash. Some Bash ...
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How can I find out the current route in Rails?

... Based on @AmNaN suggestion (more details): class ApplicationController < ActionController::Base def current_controller?(names) names.include?(params[:controller]) unless params[:controller].blank? || false end help...
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“message failed to fetch from registry” while trying to install any module

...ining a recent version of Node or installing on older Ubuntu and other apt-based distributions may require a few extra steps. Example install: sudo apt-get update sudo apt-get install -y python-software-properties python g++ make sudo add-apt-repository ppa:chris-lea/node.js sudo apt-get update su...
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Javascript Equivalent to C# LINQ Select

...r my where() + firstOrDefault(). These could also be used with the string based function constructor approach (which is the fastest), but here is another approach using an object literal as filter: Array.prototype.where = function (filter) { var collection = this; switch(typeof filter) {...
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Android: How to create a Dialog without a title?

... Well, according to the official documentation, "A dialog made with the base Dialog class must have a title. If you don't call setTitle(), then the space used for the title remains empty, but still visible. If you don't want a title at all, then you should create your custom dialog using the Aler...
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versionCode vs versionName in Android Manifest

...eave it at this? Because I think the android system checks for app updates based on Version Code instead of version number. Correct me if I'm wrong. – user838522 Mar 9 '12 at 5:15 ...
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Conveniently map between enum and int / String

...alue as part of the enum definition. He then goes on to create a generics-based lookup utility: public class ReverseEnumMap<V extends Enum<V> & EnumConverter> { private Map<Byte, V> map = new HashMap<Byte, V>(); public ReverseEnumMap(Class<V> valueType) { ...
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Repeat String - Javascript

...;>= 1, pattern += pattern; } return result + pattern; } It is based on artistoex algorithm. It is really fast. And the bigger the count, the faster it goes compared with the traditional new Array(count + 1).join(string) approach. I've only changed 2 things: replaced pattern = this ...
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How to use index in select statement?

...tion, Usually the DB engine should automatically select the index to use based on query execution plans it builds. However, there are some pretty rare cases when you want to force the DB to use a specific index. To be able to answer your specific question you have to specify the DB you are using....
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jQuery checkbox checked state changed event

... Action taking based on an event (on click event). $('#my_checkbox').on('click',function(){ $('#my_div').hide(); if(this.checked){ $('#my_div').show(); } }); Without event taking action based on current state. $('#my_...