Kai Zhang bearzk

Pluralsight Curriculum

A list of pluralsight courses to get a developer ready for backend tasks in alyne. Node.js courses should be 1st priority, you can take the others in order of your own preference and focus of work.

node.js basics

Node.js 12: Getting Started https://app.pluralsight.com/library/courses/nodejs-getting-started/table-of-contents
Advanced Node.js 12

Summary of design principles

Complexity is incremental: you have to sweat the small stuff (see p. 11).
Working code isn't enough (see p. 14).
Make continual small investments to improve system design (see p. 15).
Modules should be deep (see p. 22)

Tools

desktop tools

Alfred

pastebin history
tldr
global snippets
ip

Tech Academy Session 2021 #01

Code Smells 01/??

nested conditions, long condition block

I have to hold my breath for too long, maybe not so good for my health.

if (a) {

Queue-Based Load Leveling pattern

Why and When?

Sometimes a part of our application just can not run that fast, it could be for example, avatar processing, email sending, and in these case we don't usually need a response/confirmation that the action is finished, we can push these tasks into queue and handle them asynchronously to take the load off the system.

How?

push slow tasks into queue

	// system imports
	// 3rd party imports
	const { getSignedUrl } = require('@aws-sdk/s3-request-presigner')
	const { S3Client, GetObjectCommand } = require('@aws-sdk/client-s3')
	// local imports

	const client = new S3Client({
	region: 'eu-west-1', // region, since s3 is global, guess it doesn't really matter :)
	credentials: { // this credential should have read access to the bucket/object you want to grant temp access to the user
	accessKeyId: 'AKIAIOSFODNN7EXAMPLE',

	const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));

	const exponentialBackOff = async (func, maxRetry, delay) => {
	let res = await func();

	if (res) {
	return res;
	}

	console.log(`retrying, maxRetry ${maxRetry}`);

	/* eslint-disable max-classes-per-file */
	class Repo {
	constructor() {
	this.name = 'maomao';
	}

	work(p1, p2) {
	return (p1 + p2);
	}

	#!/bin/sh

	# this script will run eslint against staged files

	# in staged flies
	# find (M)odified and (A)dded file names,
	# find those conotains "src" or "test"
	toLint=$(git diff --name-status --cached \| grep -E "^[M\|A]" \| awk '{print $2}' \| grep -E "src\|test")

	if [ -z "$toLint" ]; then

	#!/bin/sh

	# this script will look into current staged (about to be commited) files
	# searching for the pattern from $1
	# if found, would exit with error status code 1

	# Usage:
	# when staged files contain the search pattern 'TEST'
	#
	# > ./grepPattern.sh TEST