hhimanshu

Overview

These are in no particular order. I found them by researching what methods other developers use to understand codebases that they have not seen before.

Recommendations

• If the codebase has tests, read the tests
• Try to write tests for the part of codebase you are trying to understand. This helps in understanding the behavior and serve as documentation
• Get overview of project. See the overall picture. How many modules it has? What are the name of the modules? Pick one module and do deep dive into it.
• Writing documentation for source code. This is a good practice to understand the codebase. I tend to prefer writing tests over documentation since the source code and tests are truth, documentation decays over time, generally.

hhimanshu

# First remove the app from `/Applications`
rm -rf  ~/Library/Caches/IdeaIC201*; rm -rf ~/Library/Preferences/IdeaIC201*;rm -rf ~/.ivy2/cache

hhimanshu

import java.io.File
import java.net.URL

// Note: This has dependency on apache commons-io
import org.apache.commons.io.FileUtils

object LoadFile extends App {
  override def main(args: Array[String]): Unit = {
    val fileName = "myfileJarFile.json"
    val path: URL = getClass.getClassLoader.getResource("v410.all/" + fileName)

hhimanshu

This gist will contain all the exercises from the book

hhimanshu

All exercises are attempted on https://coderpad.io

hhimanshu

// Dependency: elastic4s
import java.util.Calendar

import com.sksamuel.elastic4s.ElasticDsl._
import com.sksamuel.elastic4s.source.StringDocumentSource
import com.sksamuel.elastic4s.{ElasticClient, ElasticsearchClientUri}
import org.elasticsearch.action.index.IndexResponse

import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future

hhimanshu

#!/usr/bin/env node

const {execSync} = require('child_process');

const runCommand = command => {
  try {
    execSync(`${command}`, {stdio: 'inherit'});
  } catch (e) {
    console.error(`Failed to execute ${command}`, e);
    return false;

hhimanshu

export const VideoPlayer = ({youtubeId}: VideoPlayerProps) => {
    useEffect(() => {
        const options = {
            noCookie: false,
            rel: 0,
            showinfo: 1,
            iv_load_policy: 3,
            modestbranding: 1
        }
        if (typeof document !== `undefined`) {

hhimanshu

for loop

let numUsers = 0;
for(let num = 0; num < 22; num++){
  numUsers = numUsers+1;
}
console.log('Number of users are: '+ numUsers); //implicit coercison from number to string

hhimanshu

% http://www.erlang.org/course/exercises.html
% Write functions temp:f2c(F) and temp:c2f(C) which convert between centigrade and Fahrenheit scales. (hint 5(F-32) = 9C)
-module(temp).
-export([c2f/1, f2c/1, convert/1]).

c2f(C) -> (C *9/5) + 32.
f2c(F) -> (F - 32) * 5/9.

convert({From, What}) ->
        case {From, What} of