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使用 XML 和 Web 服务 · App Inventor 2 中文网
...pair just as in the last example above, except that the list of pairs will now include an additional pair (content, (happy sad)) where the second item in the additional pair is the list of strings “happy” and “sad”.
It is also possible that the XML contains elements with attributes, for exa...
What's this =! operator? [duplicate]
...ls' operator. This usage was deprecated by the creation of Standard C, so now it means 'assign the logical inverse', as in a = !b. This is a good argument for always surrounding binary operators with spaces, just to make it clear to the humans reading the code what the compiler is thinking.
I'm a...
How can prepared statements protect from SQL injection attacks?
...t exactly true. MySQL has supported prepared statements for quite a while now. The PDO driver has as well. But yet, MySQL queries were still prepared by PDO by default, last time i checked.
– cHao
Aug 18 '13 at 9:32
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Check if an array is empty or exists
...ypeof array.length; // => "number"
Case Empty Array
Now since we tested all other possibilities, we're talking to an instance of Array. In order to make sure it's not empty, we ask about number of elements it's holding, and making sure it has more than zero elements.
firstArr...
Order of event handler execution
...Ah, I see where I'm going wrong: "Event handlers are delegates, right?". I now know they're not. Have written myself an event that fires handlers in reverse order, just to prove it to myself :)
– Rawling
Mar 1 '10 at 10:56
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How do I squash two non-consecutive commits?
...he rebase will be aborted.
#
# Note that empty commits are commented out
Now you change the file that it looks like this:
pick aaaaaaa Commit A
squash ddddddd Commit D
pick bbbbbbb Commit B
pick ccccccc Commit C
And git will now meld the changes of A and D together into one commit, and put B an...
Remove all classes that begin with a certain string
...eral groups. Each group has a specific prefix. In the javascript, I don't know which class from the group is on the div. I want to be able to clear all classes with a given prefix and then add a new one. If I want to remove all of the classes that begin with "bg", how do I do that? Something like th...
In Android, how do I set margins in dp programmatically?
...arams. If you use relative layout, import LinearLayout.LayoutParams , etc.
Now, if you set the margin using Layout_marginLeft, Right, etc, you need to update margin in this way
layoutParams.setMargins(left, top, right, bottom);
If you set margin using the new layout_marginStart, you need to update ...
How to trigger HTML button when you press Enter in textbox?
...t to the button you'd like to be default and type=button to other buttons. Now in the form below you can hit Enter in any input fields, and the Render button will work (despite the fact it is the second button in the form).
Example:
<button id='close_renderer_button' class='btn btn-success...
How do I specify local .gem files in my Gemfile?
... Super trick! here is small addition for that. How to verify that gems are now available locally: gem list -r --clear-sources -s file:/repo
– Алексей Лещук
Oct 9 '19 at 14:50
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