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Microsecond timing in JavaScript
... It returns the number of microseconds in the fractional (e.g. a value of 1000.123 is 1 second and 123 microseconds).
now() is monotonically increasing. This is important as Date.getTime() can possibly jump forward or even backward on subsequent calls. Notably, if the OS's system time is updated (...
Using IQueryable with Linq
...standpoint, you may only return 2 records across the network instead of 20,000....
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Is floating point math broken?
...tandard binary64 format, the representation can be written exactly as
0.1000000000000000055511151231257827021181583404541015625 in decimal, or
0x1.999999999999ap-4 in C99 hexfloat notation.
In contrast, the rational number 0.1, which is 1/10, can be written exactly as
0.1 in decimal, or
0x1.99...
Canvas width and height in HTML5
...;
}
pre {
padding: 1em;
}
.slider {
width: 10px;
background: #000;
}
.right {
flex 1 1 auto;
}
<div class="frame">
<div class="left">
<canvas id="c"></canvas>
</div>
<div class="slider">
</div>
<div class="righ...
Tactics for using PHP in a high-load site
...er done scaling. A site that handles 10req/s will need changes to support 1000req/s. And if you're lucking enough to need to support 10,000req/s, your architecture will probably look completely different as well.
Databases
Don't use MySQLi -- PDO is the 'modern' OO database access layer. The most...
Is there a unique Android device ID?
...
String deviceId = deviceUuid.toString();
might result in something like: 00000000-54b3-e7c7-0000-000046bffd97
It works well enough for me.
As Richard mentions below, don't forget that you need permission to read the TelephonyManager properties, so add this to your manifest:
<uses-permission and...
Creating an API for mobile applications - Authentication and Authorization
...ing design
choices such as Spring Security.
So now that the view from 30,000ft is complete how do you go about doing it? Well, it's not that hard to create an authentication and authorisation system based on the listed technologies on the server side with a browser client. In combination with HTTP...
Android: Want to set custom fonts for whole application not runtime
..._vertical"
android:text="text"
android:textColor="#000"
android:textSize="23sp"
custom:typeFace="metanormal"/>
and you can change the font progrmaticlly with setTypeFace method
also you can move the custom namespace to your parent layout if you wa...
Where do you store your salt strings?
...mplicated. some attackers may take the salt and hash and check only the 10,000 most common passwords. that way they will get a decent number of people. if, however, they dont have access to the salt, that is akin to the user having a longer more secure password. now, how likely is it that the salt d...
When and why are database joins expensive?
...e performance, IME, is caching calculated values instead of reading the 10,000 rows required to calculate them.
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