Programming

A six-step framework to tackle any system design question

A six-step framework to tackle any system design question

Introduction In the book of System Design Interview by Lewis C. Lin, a six-step framework called PEDALS is introduced to help answer any system design question. PEDALS stand for: * Process requirements * Estimate * Design the service * Articulate the data model * List the architectural components * Scale The systematic method will power you

The complete guide to System Design

The complete guide to System Design

The complete guide to System Design in 2022 covers: * What is System Design? * System Design fundamentals * Horizontal and vertical scaling * Microservices * Proxy servers * CAP theorem * Redundancy and replication * Storage * Block storage * File storage * Object storage * Redundant Disk Arrays (RAID) * Message queues * Kafka * File systems * Google File System (GFS) * Hadoop Distributed

AngularJS table creation for dynamic number of columns

AngularJS table creation for dynamic number of columns

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Hide and display html elements

Hide and display html elements

Scale a system to support millions of users

Scale a system to support millions of users

Start from single server Building a large scale system is not one time effort, it should be an iterative process as the user workload increases. The journey could just start with single server and single user request. 1. User access a website through domain name, such as example.com 2.

Set in golang

Set in golang

Go does not have set by default but there is way to imitate it in Go. The following is an example code piece to create "set" in Go by setting a map with empty values. $ cat test.go package main import ( "fmt" ) // Main function func main() { set := make(map[string]

Concepts you should know

Concepts you should know

Data structure Bloom filter A Bloom filter is a space-efficient probabilistic data structure that is used to test whether an element is a member of a set. For example, checking availability of username is set membership problem, where the set is the list of all registered username. The price we

Solve LeetCode problems in Visual Studio Code

Solve LeetCode problems in Visual Studio Code

Install the leetcode extension in VS Code Login to LeetCode endpoint with cookie 1. Login to leetcode from Google Chrome 2. In Chrome, Inspect -> Network -> Fetch/XHR 3. Click on any button in leetcode page, and in Inspector to the right under the "Name" tab find and select

Sorting algorithm

Sorting algorithm

In this post, it includes the following sorting algorithms. The code is self explained. * selection sort * insert sort * bubble sort * quick sort * merge sort import java.util.Arrays; public class Sort { public static void selection_sort(int[] arr) { for (int i = 0; i < arr.length - 1; i++) { int min_