nkhil

Here's how to create and export an RSA public/private key pair from Node.js

const crypto = require('crypto')
const fs = require('fs')

const { privateKey, publicKey } = crypto.generateKeyPairSync('rsa', {
  modulusLength: 2048,
})

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async function someAsyncFuncion(num) {
  return await new Promise(resolve => resolve(num))
}

function orchestrator() {
  [1, 2, 3, 4, 5].forEach(async num => {
    console.log('console 1 fired')
    const promiseResolvedValue = await someAsyncFuncion(num)
    console.log(promiseResolvedValue)
    console.log('console 2 fired')

nkhil

Calculator

This is my solution to the Calculator kata from CodeWars: https://www.codewars.com/kata/5235c913397cbf2508000048/train/ruby

Kata

Create a simple calculator that given a string of operators (), +, -, *, / and numbers separated by spaces returns the value of that expression

// Example

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const s3 = require('./s3') // This is the file where we use aws-sdk's S3 CopyObject method

const mockS3Instance = {
  copyObject: jest.fn().mockReturnThis(),
  promise: jest.fn().mockReturnThis(),
  catch: jest.fn(),
}

jest.mock('aws-sdk', () => {
  return { S3: jest.fn(() => mockS3Instance) }

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const AWS = require('aws-sdk')

// a function that returns a promise
function copyFileToS3() {
  
  // initialise AWS S3
  const s3 = new AWS.S3({
    accessKeyId: 'whatever',
    secretAccessKey: 'whatever',
    endpoint: 'http://localhost:4566', // localstack is running on port 4566. Imagine this was the real S3 endpoint

nkhil

Agenda investigation spike

Attempt 1:

BEHAVIOUR: This enforces only one instance carrying out jobs at a time

const Agenda = require('agenda');

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const path = require('path');
const { spawn } = require('child_process');

// Run using Jest

describe('logger behaviour', () => {
  it('logs out multiple params - 2 strings', done => {
    const testAppFilePath = path.join(
      __dirname,
      '../logger.js',

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const logger = require('./logger.js');

logger.info({ foo: 'bar' }, 'param2');

// Outputs:
// {"level":30,"time":1612298595613,"msg":"param2","pid":3039,"hostname":"whatever","foo":"bar","v":1}

nkhil

Sum of Pairs

Given a list of integers and a single sum value, return the first two values (parse from the left please) in order of appearance that add up to form the sum. CodeWars kata link

Note: The following solution is not by me. It was one of the first solutions in the showcase under 'Solutions'. Apologies for not attributing the authors.

var sum_pairs = function (ints, s) {

nkhil

Create bucket 'test'

awslocal s3api create-bucket --bucket test --region us-east-1

Copy local file into S3

awslocal s3 cp test.txt s3://test/test.txt