netologist

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

netologist

import time
import asyncio
import requests

domain = 'http://integralist.co.uk'
a = '{}/foo?run={}'.format(domain, time.time())
b = '{}/bar?run={}'.format(domain, time.time())

async def get(url):
   print('start: ', url)

netologist

<!DOCTYPE NETSCAPE-Bookmark-file-1>
<!-- This is an automatically generated file.
     It will be read and overwritten.
     DO NOT EDIT! -->
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
<TITLE>Bookmarks</TITLE>
<H1>Bookmarks</H1>
<DL><p>
    <DT><H3 ADD_DATE="1604897638" LAST_MODIFIED="0" PERSONAL_TOOLBAR_FOLDER="true">Bookmarks bar</H3>
    <DL><p>

netologist

(cd /some/dir && zip -r - dir-there) > file.zip
https://unix.stackexchange.com/questions/77605/change-working-directory

netologist

FROM nginx:alpine

ADD dist/ /usr/share/nginx/html
ADD /docker/nginx.conf /etc/nginx/conf.d/default.conf

EXPOSE 80

netologist

https://www.ximedes.com/test-redux-action-creators-with-jest/

netologist

#!/bin/bash

for folder in */ ; do
	d1=${folder%%_*}

	for file in "$folder"*; do
		echo "$file"
		if [[ $file =~ \.(avi|AVI|mpeg|mpg|mov|wmv|mp4)$ ]]; then
			datestr=${d1//' '/'-'}
			f=${file%%.*};

netologist

#!/bin/sh
if [ "$1" == "" ]; then
  echo "Usage: $0 <PROJECT_ROOT> <GITHUB_REPO>"
  exit 1
fi
if [ "$2" == "" ]; then
  echo "Usage: $0 <PROJECT_ROOT> <GITHUB_REPO>"
  exit 1
fi

netologist

package main

import (
	"fmt"
	"regexp"
)

// Turkish Alpabetic Numeric "(),\-./"
func IsAlphaNumeric(text string) (ok bool) {
	ok, _ = regexp.MatchString("^([\\(\\)\\,\\\\\\-\\./ a-zA-ZğüşıöçĞÜŞİÖÇ0-9]+)$", text)

netologist

const items = [1,52,14,54,[10,1,3,5],14,6];

const flatten = (arr) => {
  const flat = [].concat(...arr)
  return flat.some(Array.isArray) ? flatten(flat) : flat;
}

const splitAt = (arr, predicate) => {
  var selected = [];
  var others = [];