Learning Material

Javascript

Use Node environment to learn javascript, will need to change "alert" to "console.log", and browser objects like "document." will not be available

coding basics:

• https://javascript.info/variables
• https://javascript.info/types
• https://javascript.info/operators
• https://javascript.info/comparison
• https://javascript.info/ifelse
• https://javascript.info/switch
• https://javascript.info/logical-operators
• https://javascript.info/function-basics
• https://javascript.info/function-expressions
• https://javascript.info/javascript-specials
• timestamps
• try/catch/finally blocks
• environment variables
• validating function params or external data before use

• https://javascript.info/object
• https://javascript.info/object-copy
• https://javascript.info/closure

data types:

• https://javascript.info/data-types
• https://javascript.info/number
• https://javascript.info/string
• https://javascript.info/array
• https://javascript.info/array-methods
• https://javascript.info/map-set
• https://javascript.info/keys-values-entries
• https://javascript.info/date
• https://javascript.info/json

advanced:

• https://javascript.info/modules
• https://javascript.info/garbage-collection
• https://javascript.info/object-methods

Node

• https://www.w3schools.com/nodejs/nodejs_modules.asp

Git

• https://www.atlassian.com/git/tutorials/learn-git-with-bitbucket-cloud
• https://www.atlassian.com/git/tutorials/setting-up-a-repository
• https://www.atlassian.com/git/tutorials/saving-changes
• https://www.atlassian.com/git/tutorials/git-ssh

How we use git in Izara:

• Git development

AWS

AWS offers a free tier, you can create an account and use most services at a limited level for free for one year, then cancel the account (or stop all services) before the year is over.

Serverless Framework (sls)

• https://www.serverless.com/framework/docs
• We use the Serverless Framework to deploy AWS resources
• We do not use the Serverless hosted dashboard
• Learn the basic concepts of Serverless Framework but do not need to learn everything, we use only some elements of the framework and have a standard template for the AWS resources we use

Lambda

Lambda container persistence

• Lambda environments are not discarded after each use, they can be reused for multiple invocations
• We can use this to maintain global variables, such as database connections

DynamoDB

• Understand how partition(hash) and sort(range) keys work, why they are used

Pagination

• If there is the chance a query can return a large amount of data we need to paginate query results
• Receive a subset of all results and process them, then eg re-invoke the Lambda to process the next set of results
• messy notes: 2021-05-03 - DynamoDB pagination

SQS

SNS/SQS Message delivery

• Communication between services
• some messy notes: 2020-11-08 - Communication Between Services Ideas

SQS Batch processing

• 2020-11-28 - Handling Message Batches from SQS Queues

API Gateway

API Gateway Authorizer Lambda Functions

API Gateway Authorizers

Design Concepts

Idempotence

• messy notes: 2021-05-03 Idempotence ideas
• some notes about idempotent Lambda processing: 2020-11-28 - Handling Message Batches from SQS Queues

Middleware

• especially for Lambda functions

Izara Backend

Services to study

• NPM module - izara-middleware
• NPM module - izara-shared
• [Empty Service Template]

Project Concepts

Information in the below pages should be understood before developing:

• Repository structure
• Syntax - Backend services
• Remote repository and workspace structure
• Communication between services
• Lambda handler functions
• Idempotence and Race Conditions
• Standard Config Table Per Service

Izara Frontend

Microfrontends

• see messy notes and references at 2021-01-31 - Micro Frontends