Subrata Banerjee subratastack

Interview Questions

Node.js

Q1: What do you mean by Asynchronous API? ☆☆

Answer: All APIs of Node.js library are aynchronous that is non-blocking. It essentially means a Node.js based server never waits for a API to return data. Server moves to next API after calling it and a notification mechanism of Events of Node.js helps server to get response from the previous API call.

Source: tutorialspoint.com

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

How to run Express inside an Electron app

You can run your Express app very easily inside your Electron app.

All you need to do is to:

place all the files of your Express app inside a new app folder in your_electron_app\resources\app
reconfigure the app.js file
refactor some relative pathes in your Express app

	#IAM Permission needed: dynamodb:query

	import json
	import sys
	import boto3
	from boto3.dynamodb.conditions import Key, Attr

	dynamodb = boto3.resource('dynamodb')

	def lambda_handler(event, context):

	/**
	* Name: Stylus -padding mixin
	* Description: Mixin to set paddings
	* Author: Santiago Rincón
	* Author URI: http://github.com/rincorpes
	* Version: 2.0
	* License: GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007
	* License URI: https://www.gnu.org/licenses/gpl-3.0.en.html
	*/
	-padding()

	// Define bubble chart
	var BubbleChart = d3Kit.factory.createChart(
	// First argument is the default options for this chart
	{
	margin: {top: 60, right: 60, bottom: 60, left: 60},
	initialWidth: 800,
	initialHeight: 460
	},
	// The second argument is an Array that contains
	// names of custom events from this chart.

	// Display:
	// appearance
	// box-align
	// box-flex
	// box-sizing
	// box-orient
	// box-pack
	// display-box
	// overflow-sroll
	// user-select

	//Cross browser CSS3 mixins

	@mixin box-shadow($left, $top, $radius, $color) {
	box-shadow: $left $top $radius $color;
	-webkit-box-shadow: $left $top $radius $color;
	-moz-box-shadow: $left $top $radius $color;
	}

	@mixin transition($property, $duration, $easing: linear) {
	transition: $property $duration $easing;