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In mongoDb, how do you remove an array element by its index?
...moving by array index. In fact, this is an open issue http://jira.mongodb.org/browse/SERVER-1014 , you may vote for it.
The workaround is using $unset and then $pull:
db.lists.update({}, {$unset : {"interests.3" : 1 }})
db.lists.update({}, {$pull : {"interests" : null}})
Update: as mentioned i...
Difference between Inheritance and Composition
...than inheritance is java.util.Stack, which currently extends java.util.Vector. This is now considered a blunder. A stack "is-NOT-a" vector; you should not be allowed to insert and remove elements arbitrarily. It should've been composition instead.
Unfortunately it's too late to rectify this design ...
What is the difference between Bower and npm?
...s have many downsides. You just have to pick which you can live with.
History
npm started out managing node.js modules (that's why packages go into node_modules by default), but it works for the front-end too when combined with Browserify or webpack.
Bower is created solely for the front-end and ...
Setting DIV width and height in JavaScript
...
The properties you're using may not work in Firefox, Chrome, and other non-IE browsers. To make this work in all browsers, I also suggest adding the following:
document.getElementById('div_register').setAttribute("style","width:500px");
For cross-compatibilit...
What is “the inverse side of the association” in a bidirectional JPA OneToMany/ManyToOne association
...o understand this, you must take a step back. In OO, the customer owns the orders (orders are a list in the customer object). There can't be an order without a customer. So the customer seems to be the owner of the orders.
But in the SQL world, one item will actually contain a pointer to the other....
Installing Bootstrap 3 on Rails App
...tall Bootstrap 3.0 on my Rails app. I recently finished Michael Hartl's tutorial and am now trying to build my own system using this new version of Bootstrap, but I have a few questions that I'm not sure about.
...
POST JSON fails with 415 Unsupported media type, Spring 3 mvc
...
I've had this happen before with Spring @ResponseBody and it was because there was no accept header sent with the request. Accept header can be a pain to set with jQuery, but this worked for me source
$.postJSON = function(url, data, callback) {
...
Android Drawing Separator/Divider Line in Layout?
...like to draw a line right in the middle of a layout and use it as a separator of other items like TextView. Is there a good widget for this. I don't really want to use an image as it would be hard to match the other components to it. And I want it to be relatively positioned as well. Thanks
...
What's HTML character code 8203?
...ode Character 'ZERO WIDTH SPACE' (U+200B).
this character is intended for line break control; it has no width, but its presence between two characters does not prevent increased letter spacing in justification
As per the given code sample, the entity is entirely superfluous in this context. It...
Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...C的，所以，他是大小写字符敏感的。
下面是Lua的Hello World。注意：Lua脚本的语句的分号是可选的，这个和GO语言很类似。
1
print("Hello World")
你可以像python一样，在命令行上运行lua命令后进入lua...