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console.time("Array.push");
const array = [];
for (var i = 0; i < 1e7; i++) array[i] = i;
console.timeEnd("Array.push");

console.time("new Array.push");
const array1 = new Array(1e7);
for (var i = 0; i < 1e7; i++) array1[i] = i;
console.timeEnd("new Array.push");

stormslowly

[alias]
	st = status
	ci = commit
	co = checkout
	dt = difftool
	lg = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen%cr %C(bold blue)<%an>%Creset'
	lp = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen%cr %C(bold blue)<%an>%Creset'
	ca = commit -a
[color]
	ui = auto

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Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

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Download videos from egghead

Go to the egghead website, i.e. Building a React.js App

run

var links = $('h4 a').get().map(function(a){ return a.href}).join('\n')
copy(links)

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ffmpeg -i "17 Audio Track.aiff" -f mp3 -acodec libmp3lame -ab 192000 -ar 44100 17.mp3

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vcl 4.0;

acl purgers {
    "localhost";
    "127.0.0.1";
    "192.168.199.0"/24;
}

backend default {
    .host = "localhost";

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# you should download the files in m3u8 file first
ffmpeg -i the.file.m3u8 -acodec copy -vcodec copy  -y -loglevel info -bsf:a aac_adtstoasc -f mp4 your-mp4-file.mp4


# First 10 Minutes
ffmpeg -i VIDEO_SOURCE.mp4 -vcodec copy -acodec copy -ss 0 -t 00:10:00  VIDEO_PART_1.mpg
# Second 10 Minutes
ffmpeg -i VIDEO_SOURCE.mp4 -vcodec copy -acodec copy -ss 00:10:00 -t 00:20:00  VIDEO_PART_2.mpg
# Rest after the first 20 Minutes
ffmpeg -i VIDEO_SOURCE.mp4 -vcodec copy -acodec copy -ss 00:20:00  VIDEO_PART_3.mpg

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var day  = 24*3600*1000;
var expiredTime = Date.now() - day *90;
var expiredDate = new Date(expiredTime);

var objectIdFromDate = function (date) {
	var idStr = Math.floor(date.getTime() / 1000).toString(16) + "0000000000000000";
	return new ObjectId(idStr);
};

db.tokens.remove({_id:{$lt:objectIdFromDate(expiredDate)}})

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'use strict';
var zlib = require('zlib');
var fs = require('fs');

var fileName = process.argv[2];
var buffer = fs.readFileSync(fileName);
zlib.unzip(buffer, function(_, buf) {
  // console.log(buf.toString('hex'));
  console.log(buf.toString());
});

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someCMD | awk 'BEGIN{cmd="date +%H:%M:%S.%N"} {cmd|getline D; close(cmd); print D,$0}'
"this way slow down the cmd execute try below

someCMD | awk '{print strftime("%H:%M:%S"),$0}'