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Collisions when generating UUIDs in JavaScript?
...
node-uuid has a test harness that you can use to test the distribution of hex digits in that code. If that looks okay then it's not Math.random(), so then try substituting the UUID implementation you're using into the uuid() method there and see if you still get good results.
[Update: Just saw Ve...
What is the difference between encode/decode?
...somecodec) is meaningful for these values of somecodec:
base64
bz2
zlib
hex
quopri
rot13
string_escape
uu
I am not sure what decoding an already decoded unicode text is good for. Trying that with any encoding seems to always try to encode with the system's default encoding first.
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How to properly add cross-site request forgery (CSRF) token using PHP
...ion_start();
if (empty($_SESSION['token'])) {
$_SESSION['token'] = bin2hex(random_bytes(32));
}
$token = $_SESSION['token'];
Sidenote: One of my employer's open source projects is an initiative to backport random_bytes() and random_int() into PHP 5 projects. It's MIT licensed and available on ...
How can one print a size_t variable portably using the printf family?
...u\n", x); // prints as unsigned decimal
printf("%zx\n", x); // prints as hex
printf("%zd\n", y); // prints as signed decimal
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Creating Unicode character from its number
...emember that the escape sequences in Java source code (the \u bits) are in HEX, so if you're trying to reproduce an escape sequence, you'll need something like int c = 0x2202.
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What is the difference between UTF-8 and Unicode?
...0xxxxxxx 7 007F hex (127)
110xxxxx 10xxxxxx (5+6)=11 07FF hex (2047)
1110xxxx 10xxxxxx 10xxxxxx (4+6+6)=16 FFFF hex (65535)
11110xxx 10xxxxxx 10xxxxxx 10xxxx...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...用性。
3) 依赖关系
平台中各个模块之间的关系尽量是低耦合的，可以通过相关的消息组件进行交互，能异步则异步，分清楚数据流转的主流程和副流程，主副是异步的，比如记录日志可以是异步操作的，增加整个系统的可用...
Version vs build in Xcode
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To increment In Hex numbers you can use buildNumber=$(/usr/libexec/PlistBuddy -c "Print CFBundleVersion" "$INFOPLIST_FILE") dec=$((0x$buildNumber)) buildNumber=$(($dec + 1)) hex=$(printf "%X" $buildNumber) /usr/libexec/PlistBuddy -c "Set :CF...
How do shift operators work in Java? [duplicate]
...the right. For example, the following program converts a byte value to its hexadecimal string representation. Notice that the shifted value is masked by ANDing it with 0x0f to discard any sign-extended bits so that the value can be used as an index into the array of hexadecimal characters.
// Maski...
Best way to create unique token in Rails?
...vitations. This produces a 40 character alphanumeric string.
Digest::SHA1.hexdigest([Time.now, rand].join)
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