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@ variables in Ruby on Rails

What's the difference between @title and title ? Since both of them can be variable names. Also, how do I decide which kind of variable I should use? With @ or not? ...
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What is The difference between ListBox and ListView

What is the difference between WPF's ListBox and ListView? I can not find any significant difference in their properties. Is there different typical use? ...
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Insert line break inside placeholder attribute of a textarea?

... a line \nthis should be a new line'); Then you could remove it on focus and apply it back (if empty) on blur. Something like this var placeholder = 'This is a line \nthis should be a new line'; $('textarea').attr('value', placeholder); $('textarea').focus(function(){ if($(this).val() === p...
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Round to at most 2 decimal places (only if necessary)

... @James Wow that's really weird- I'm working in the Chrome dev console and I'm noticing that 1.005 * 100 = 100.49999999999999. Math.round(100.49999999999999) evaluates to 100, whereas Math.round(100.5) evaluates to 101. IE9 does the same thing. This is due to floating point weirdness in javascri...
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What does “The APR based Apache Tomcat Native library was not found” mean?

... really want it, download the tcnative-1.dll (or libtcnative.so for Linux) and put it in the bin folder, and add a system property to the launch configuration of the tomcat server in eclipse. -Djava.library.path=c:\dev\tomcat\bin ...
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Android: How to change CheckBox size?

... You just need to set the related drawables and set them in the checkbox: <CheckBox android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="new checkbox" android:background="@drawable/my_checkbox_background" and...
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tag in Twitter Bootstrap not functioning correctly?

... 18px 0; } It correspond to a 1px horizontal line with a very light grey and vertical margin of 18px. and because <hr> is inside a <div> without class the width depends on the content of the <div> if you would like the <hr> to be full width, replace <div> with <d...
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How to generate javadoc comments in Android Studio

Can I use shortcut keys in Android studio to generate javadoc comments? 16 Answers 16 ...
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How to visualize an XML schema? [closed]

I have made an XML Schema - all the code basically - and was wondering if there is a way that the code can generate something like this: ...
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Delete keychain items when an app is uninstalled

I am using idandersen's scifihifi-iphone code for keychain and save password using 8 Answers ...