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Why does Enumerable.All return true for an empty sequence? [duplicate]
...s back)
Same goes for Any (the opposite of All) returning false for empty sets.
Edit:
You can imagine All to be implemented semantically the same as:
foreach (var e in elems)
{
if (!cond(e))
return false;
}
return true; // no escape from loop
...
What's the nearest substitute for a function pointer in Java?
... Map<K, S> m1, Map<K, T> m2, Map<K, R> results){
Set<K> keySet = new HashSet<K>();
keySet.addAll(m1.keySet());
keySet.addAll(m2.keySet());
results.clear();
for (K key : keySet) {
results.put(key, fn.eval(m1.get(key), m2.get(key...
How to add JTable in JPanel with null layout?
...emonstrate how to use nested layouts. All the layouts that are explicitly set are shown as a titled-border for the panel on which they are used.
Notable aspects of the code are:
There is a combo-box to change PLAF (Pluggable Look and Feel) at run-time.
The GUI is expandable to the user's need.
T...
Run javascript function when user finishes typing instead of on key up?
...ed the input in question will be #myInput.
Making a few assumptions...
//setup before functions
var typingTimer; //timer identifier
var doneTypingInterval = 5000; //time in ms, 5 second for example
var $input = $('#myInput');
//on keyup, start the countdown
$input.on('keyup', func...
Creating and Update Laravel Eloquent
...e example from there is:
// If there's a flight from Oakland to San Diego, set the price to $99.
// If no matching model exists, create one.
$flight = App\Flight::updateOrCreate(
['departure' => 'Oakland', 'destination' => 'San Diego'],
['price' => 99]
);
which pretty much clears e...
Android - border for button
...917" />
</shape>
And add button to your XML activity layout and set background android:background="@drawable/button_border".
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/button_border"
android:text="Butto...
Play sound on button click android
...button1);
final MediaPlayer mp = MediaPlayer.create(this, R.raw.soho);
one.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
mp.start();
}
});
To explain it step by step:
Button one = (Button) this.findViewById(R.id.button1);
First is the initialization of...
Error 1103: Unable to complete the given request · App Inventor 2 中文网
...navbar .nav-link .mdi, .navbar .dropdown-item .mdi { margin-right: 6px; opacity: .7; } 创建 Apps 文档 文档首页 内置块参考文档 组件参考文档 拓展参考文档 概念参考文档 IoT 参考文档 技术和其他指南...
Programmatically obtain the phone number of the Android phone
...my old mobile number was ported over to it. It probably still does, as the Settings app still shows that defunct number. Also, there are reports that some SIMs cause this method to return null. That being said, I'm not aware of a better answer.
– CommonsWare
Ma...
Is there a way to @Autowire a bean that requires constructor arguments?
... Thanks for the tip, but I don't understand how that relates to setting the constructor arg for the injected bean. From what I can tell from the spring docs, it is good for setting default values, but doesn't specify how to pass a constructor arg.
– Eric B.
...