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What's the right way to pass form element state to sibling/parent elements?
...a two way binding, you're telling the Root component that "hey, something happened down here, check out the values" or you're passing the state of some data in the child component up in order to update the state. You changed the state in C1, and you want C2 to be aware of it, so, by updating the sta...
Get a filtered list of files in a directory
...osed to os.listdir just returning the file name. At least this is what is happening in Python 2.
– k427h1c
May 1 '19 at 19:41
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App Inventor 2 BLE扩展源码分析 - WriteBytes vs WriteStrings 23字节硬编...
...发送时硬件收不到或收到截断数据。
源码仓库: mit-cml/appinventor-extensions (extension/bluetoothle 分支)
关键文件：
- BluetoothLE.java（2975行）-- 公开API层
- BluetoothLEint.java（3165行）-- 内部实现层
二、核心发现：23字节硬编码限制
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How to implement a ViewPager with different Fragments / Layouts
...aware that I am using the support-library's Fragment:
android.support.v4.app.Fragment
MainActivity.java (Initializes the Viewpager and has the adapter for it as an inner class). Again have a look at the imports. I am using the android.support.v4 package.
import android.os.Bundle;
import android...
What is the difference between a generative and a discriminative algorithm?
...or example, you could use p(x,y) to generate likely (x,y) pairs.
From the description above, you might be thinking that generative models are more generally useful and therefore better, but it's not as simple as that. This paper is a very popular reference on the subject of discriminative vs. gener...
How should equals and hashcode be implemented when using JPA and Hibernate
...
Hibernate has a nice and long description of when / how to override equals() / hashCode() in documentation
The gist of it is you only need to worry about it if your entity will be part of a Set or if you're going to be detaching / attaching its instances...
How would I extract a single file (or changes to a file) from a git stash?
...sh manpage you can read (in the "Discussion" section, just after "Options" description) that:
A stash is represented as a commit whose tree records the state of the
working directory, and its first parent is the commit at HEAD when the
stash was created.
So you can treat stas...
how to get request path with express req object
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It's definitely the middleware. This happens with additional routers in Express 4 as well. When either is mounted off of a given path, inside of itself it gets to pretend that it's off of the root. That's nice for isolation, but tricky when you don't know how t...
Can I use a function for a default value in MySql?
...asily create a trigger to do this, such as:
CREATE TRIGGER before_insert_app_users
BEFORE INSERT ON app_users
FOR EACH ROW
SET new.api_key = uuid();
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Side-by-side plots with ggplot2
...and save_plot() makes the saved image twice as wide.)
For a more in-depth description of how to arrange plots in a grid see this vignette. There is also a vignette explaining how to make plots with a shared legend.
One frequent point of confusion is that the cowplot package changes the default ggp...