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Hidden features of Scala
...g pattern matching and extractors. Whenever you define a val or var, what comes after the keyword is not simply an identifier but rather a pattern. That's why this works:
val (a, b, c) = (1, 3.14159, "Hello, world")
The right hand expression creates a Tuple3[Int, Double, String] which can match...
How to correctly save instance state of Fragments in back stack?
...tManager()
.beginTransaction()
.add(R.id.my_container, myFragment, MY_FRAGMENT_TAG)
.commit();
} else {
myFragment = (MyFragment) getSupportFragmentManager()
.findFragmentByTag(MY_FRAGMENT_TAG);
}
...
}
Note however th...
How do I create a parameterized SQL query? Why Should I?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Why is char[] preferred over String for passwords?
...ssword (plaintext or otherwise). You get it from the browser as part of an HTTP request, for instance. You cannot control the delivery, but you can control your own storage, so as soon as you get it, put it in a char[], do what you need to do with it, then set all to '0' and let the gc reclaim it.
...
Determine Whether Two Date Ranges Overlap
...
Proof:
Let ConditionA Mean that DateRange A Completely After DateRange B
_ |---- DateRange A ------|
|---Date Range B -----| _
(True if StartA > EndB)
Let ConditionB Mean that DateRange A is Completely Before DateRange B
|---- DateRange A ...
What is the strict aliasing rule?
...sg) onto a buffer of the word size of your system (like a pointer to uint32_ts or uint16_ts). When you overlay a struct onto such a buffer, or a buffer onto such a struct through pointer casting you can easily violate strict aliasing rules.
So in this kind of setup, if I want to send a message to so...
How to calculate dp from pixels in android programmatically [duplicate]
...dp, for that you must use the method described here: https://stackoverflow.com/a/17880012/504611 (quoted below for convenience).
Without Context object, elegant static methods:
public static int dpToPx(int dp) {
return (int) (dp * Resources.getSystem().getDisplayMetrics().density);
}
publi...
Is “double hashing” a password less secure than just hashing it once?
...lled "key strengthening" or "key stretching". See en.wikipedia.org/wiki/Key_stretching
– user41871
Dec 7 '08 at 22:40
17
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Bootstrap 3 offset on right not left
...o more than 12.
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<div class="container">
<div class="row">
<div class="col-xs-3 col-xs-offset-9">
I'm a right column of 3
</div>
</div>
...
adb shell command to make Android package uninstall dialog appear
...
You can do it from adb using this command:
adb shell am start -a android.intent.action.DELETE -d package:<your app package>
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