jboner

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

dongyuwei

if (!Date.prototype.toISOString) {
    Date.prototype.toISOString = function () {
        function pad(n) { return n < 10 ? '0' + n : n; }
        function ms(n) { return n < 10 ? '00'+ n : n < 100 ? '0' + n : n }
        return this.getFullYear() + '-' +
            pad(this.getMonth() + 1) + '-' +
            pad(this.getDate()) + 'T' +
            pad(this.getHours()) + ':' +
            pad(this.getMinutes()) + ':' +
            pad(this.getSeconds()) + '.' +

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

hofmannsven

MySQL

Getting started

• http://www.sqlteaching.com/
• https://www.codecademy.com/learn/learn-sql
• https://www.codecademy.com/catalog/language/sql

Related tutorials

• MySQL-CLI
• Analyzing Business Metrics

ishu3101

#!/usr/bin/env node

var args = process.argv.slice(2);
var input = args[0];

var isTTY = process.stdin.isTTY;
var stdin = process.stdin;
var stdout = process.stdout;

// If no STDIN and no arguments, display usage message

lalkmim

Lesson 1 - Iterations
- BinaryGap - https://codility.com/demo/results/trainingU2FQPQ-7Y4/

Lesson 2 - Arrays
- OddOccurrencesInArray - https://codility.com/demo/results/trainingFN5RVT-XQ4/
- CyclicRotation - https://codility.com/demo/results/trainingSH2W5R-RP5/

Lesson 3 - Time Complexity
- FrogJmp - https://codility.com/demo/results/training6KKWUD-BXJ/
- PermMissingElem - https://codility.com/demo/results/training58W4YJ-VHA/

remarkablemark

JavaScript Classes - ES5 vs ES6

An example that shows the difference between creating a JavaScript class and subclass in ES5 and ES6.

Reference

wojteklu

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

---

General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

derofim

Script tested on Windows 10 64bit.

1. Install git bash from https://git-for-windows.github.io/
   Git allows to use linux commands on windows.
2. Open Git Bash Command Line
   Simply right-click on a folder in Windows Explorer to access the BASH or GUI.
   https://git-for-windows.github.io/img/gw1.png
3. You can use "mv" command to rename "VeryLongFileName.ext" to "shortFileName.ext" like this:
   mv "VeryLongFileName.ext" "shortFileName.ext"
4. If you need to rename a lot of files in folder use shorten.sh below.

rivo

package main

import (
	"database/sql"
	"fmt"
	"net/url"
	"os"
	"reflect"
	"regexp"
	"strconv"