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Best way to add comments in erb

... i.e. there can't be any space between <% and # – John Douthat May 5 '10 at 22:30 How...
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Limit number of characters allowed in form input text field

...umberKey(event)" /> However, this may or may not be affected by your handler. You may need to use or add another handler function to test for length, as well. share | improve this answer ...
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What's the difference between ES6 Map and WeakMap?

Looking this and this MDN pages it seems like the only difference between Maps and WeakMaps is a missing "size" property for WeakMaps. But is this true? What's the difference between them? ...
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How to import a class from default package

I am using Eclipse 3.5 and I have created a project with some package structure along with the default package. I have one class in default package - Calculations.java and I want to make the use of that class in any of the package (for instance in com.company.calc ). When I try to make the use of...
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How can I check if a value is a json object?

My server side code returns a value which is a json object on success and a string 'false' on failure. Now how can I check whether the returned value is a json object? ...
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How do I prompt a user for confirmation in bash script? [duplicate]

... do dangerous stuff fi I incorporated levislevis85's suggestion (thanks!) and added the -n option to read to accept one character without the need to press Enter. You can use one or both of these. Also, the negated form might look like this: read -p "Are you sure? " -n 1 -r echo # (optional) mov...
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Remote debugging Tomcat with Eclipse

... it. Eclipse doesn't actually say anything when it successfully connects, and reconnecting a second time forces the error. So it was working, but I just didn't notice. – victor Oct 1 '10 at 17:18 ...
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MySQL INNER JOIN select only one row from second table

I have a users table and a payments table, for each user, those of which have payments, may have multiple associated payments in the payments table. I would like to select all users who have payments, but only select their latest payment. I'm trying this SQL but i've never tried nested SQL sta...
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App Inventor 2 拓展参考文档 · App Inventor 2 中文网

...】ActionBar 拓展 - 溢出菜单,…菜单 【UI】ScrollArrangementHandler 滚动布局管理器拓展:同一屏幕内页面切换效果 【UI】AlphaDialog 扩展:自定义对话框 【UI】Flubbie 拓展:为App添加魔法动画 【UI】SideBar 拓展:实现App的侧边栏效...
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What is that “total” in the very first line after ls -l? [closed]

...m does not mention that line, but info coreutils ls does. How comes man ls and info coreutils ls have different information about the same command? Why isn't ls just documented once? Having two different documentations for the same command seems like set up for failure. – Hello...