ovidiuch

CREATE DATABASE dbname DEFAULT CHARACTER SET utf8 DEFAULT COLLATE utf8_general_ci;

GRANT SELECT, INSERT, UPDATE, DELETE ON dbname.* TO 'usr'@'localhost' IDENTIFIED BY 'passwd';

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

mitchtech

/* Arduino USB Keyboard HID demo
 * Volume+/Volume-/Mute keys
 */

uint8_t buf[8] = { 
  0 }; 	/* Keyboard report buffer */

#define PIN_VOLUME_UP 5
#define PIN_VOLUME_DOWN 6
#define PIN_MUTE 7

bentonporter

require 'openssl'
require 'Base64'

key = "secret-key"
data = "some data to be signed"
Base64.encode64(OpenSSL::HMAC.digest(OpenSSL::Digest::Digest.new('sha256'), key, data)).strip()

nightire

Routes

小心地使用 Match（Rails 3 已实现）

Rails 3 提供了 match 方法供我们自定义 routes，然而我们要小心使用它以避免“跨站脚本攻击”（XSS Attack）。比如像这样的 routes：

注：（r3 代表 Rails 3，r4 代表 Rails 4）

# routes.rb

maxlapshin

%% @doc This is a simple geo-dns server
%% It takes existing erlang dns query parser and https://github.com/mochi/egeoip
%% Here is no implemented database for path routing with some region affinity,
%% so if you are going to use it, you need to implement following databases:
%% 1) Domain -> existing servers
%% 2) Country -> region
%% 3) region -> existing server
-module(gdns).
-author("Max Lapshin <[email protected]>").
-export([start_link/0]).

blackjid

var gulp = require('gulp');
var concat = require('gulp-concat');
var sass = require('gulp-sass');
var minifyCss = require('gulp-minify-css');
var rename = require('gulp-rename');
var connect = require('gulp-connect');
 
var paths = {
  css: ['./www/css/**/*.css'],
  js: ['./www/js/**/*.js'],

asaaki

# http://erlang.org/doc/man/erl.html
# --erl     erlang VM attributes/flags
# +A 32     async-threads
# +K true   kernel-poll if supported
# +P 524288 max number of simultaneous processes
iex --erl '+A 32 +K true +P 524288'

shingchi

根据Unicode5.0整理如下：

1）标准CJK文字
http://www.unicode.org/Public/UNIDATA/Unihan.html

2）全角ASCII、全角中英文标点、半宽片假名、半宽平假名、半宽韩文字母：FF00-FFEF
http://www.unicode.org/charts/PDF/UFF00.pdf

3）CJK部首补充：2E80-2EFF
http://www.unicode.org/charts/PDF/U2E80.pdf

luikore

# http://zh.wikipedia.org/wiki/中文数字
# http://china.younosuke.com/03_013.html

module ChineseNum
  extend self

  UPPER_ZERO = '零'
  LOWER_ZERO = '〇'
  UPPER_DIGITS = %w[壹 贰 叁 肆 伍 陆 柒 捌 玖].unshift nil
  LOWER_DIGITS = %w[一 二 三 四 五 六 七 八 九].unshift nil