Ajaykumar pajaydev

Useful Commands

## search throught the command history 
ctrl-r

!! ## Run the last executed command
top -0 vsize #check why mac is slow
uptime #check how long the system has been running.

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`

Object.keys vs for..in vs getOwnPropertyNames vs Object.entries

const language = {
  name: 'JavaScript',
  author: 'Brendan Eich'
};

// Inheriting from another object.
Object.setPrototypeOf(language, {createdAt: "Netscape"});

Object.seal vs Object.freeze vs Object.preventExtensions()

Object.seal()

/**
 * The Object.seal() method seals an object: that is, prevents new properties to be getting added and making all existing properties
 * non-configurable.
 *
 * @Reference:
 * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/seal
 */

Using HTTPS for local development using node/express js

Installation:

Install brew (package manager for mac os)

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

Install mkcert[https://github.com/FiloSottile/mkcert] a. For mac

brew install mkcert

	/* Big tablet to 1200px */
	@media only screen and (max-width: 1200px) {

	}

	/* Small tablet to big tablet: from 768px to 1023px */
	@media only screen and (max-width: 1023px) {

	}

	###################################################################
	###################### DOCKER #################################
	###################################################################
	# check docker is installed in your system by typing docker
	$ docker

	###################### IMAGES #################################
	# To check all exisiting docker images
	$ docker images


	// use reduce function to find sum of all elements in array
	const array = [1,2,3,4,5];
	const sumValue = array.reduce((sum, value)=> sum + value, 0); // 15

	// check all the children is valid or not.
	root.children.every(child => !child)


	// filtering the values in JSON.stringify.

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset='utf-8'>
	<meta http-equiv='X-UA-Compatible' content='IE=edge'>
	<title>Ebay node api demo</title>
	<meta name='viewport' content='width=device-width, initial-scale=1'>
	<link rel='stylesheet' type='text/css' media='screen' href='main.css'>
	<script src='main.js'></script>
	</head>

	curl https://www.ebay.com --header "Accept-Language: es"
	curl https://www.ebay.com --silent \| grep JavaScript