(by @andrestaltz)
If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.
# | |
# Wide-open CORS config for nginx | |
# | |
location / { | |
if ($request_method = 'OPTIONS') { | |
add_header 'Access-Control-Allow-Origin' '*'; | |
# |
var http = require('http'), | |
fileSystem = require('fs'), | |
path = require('path') | |
util = require('util'); | |
http.createServer(function(request, response) { | |
var filePath = 'path_to_file.mp3'; | |
var stat = fileSystem.statSync(filePath); | |
response.writeHead(200, { |
Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
from datetime import datetime | |
from sqlalchemy import Column, Integer, DateTime, ForeignKey | |
from sqlalchemy.orm import relationship | |
from sqlalchemy.ext.declarative import declared_attr | |
from flask_security import current_user | |
class AuditMixin(object): | |
created_at = Column(DateTime, default=datetime.now) | |
updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now) |
sudo apt-get install libsnappy-dev | |
wget https://leveldb.googlecode.com/files/leveldb-1.9.0.tar.gz | |
tar -xzf leveldb-1.9.0.tar.gz | |
cd leveldb-1.9.0 | |
make | |
sudo mv libleveldb.* /usr/local/lib | |
cd include | |
sudo cp -R leveldb /usr/local/include |
##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### | |
### Shell script to download Oracle JDK / JRE / Java binaries from Oracle website using terminal / command / shell prompt using wget. | |
### You can download all the binaries one-shot by just giving the BASE_URL. | |
### Script might be useful if you need Oracle JDK on Amazon EC2 env. | |
### Script is updated for every JDK release. | |
### Features:- | |
# 1. Resumes a broken / interrupted [previous] download, if any. | |
# 2. Renames the file to a proper name with including platform info. |
(by @andrestaltz)
If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.
package main | |
import ( | |
"net/http" | |
"database/sql" | |
"fmt" | |
"log" | |
"os" | |
) |
<?xml version="1.0" encoding="utf-8"?> | |
<android.support.v7.widget.CardView | |
android:id="@+id/card_view_friend" | |
xmlns:android="http://schemas.android.com/apk/res/android" | |
xmlns:card_view="http://schemas.android.com/apk/res-auto" | |
android:layout_width="wrap_content" | |
android:layout_height="wrap_content" | |
card_view:cardCornerRadius="4dp" | |
card_view:cardUseCompatPadding="true"> |
Below are the Big O performance of common functions of different Java Collections. | |
List | Add | Remove | Get | Contains | Next | Data Structure | |
---------------------|------|--------|------|----------|------|--------------- | |
ArrayList | O(1) | O(n) | O(1) | O(n) | O(1) | Array | |
LinkedList | O(1) | O(1) | O(n) | O(n) | O(1) | Linked List | |
CopyOnWriteArrayList | O(n) | O(n) | O(1) | O(n) | O(1) | Array |