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Promise.all This API will allow us to take in an iterable, an array of promises and return a new promise. That returned promise will only be resolved when all listed promises are resolved, the array of their results will become the result of this returned pr...

async keyword async keyword is placed before a function like so: async function f() { return 1; } It basically make your function always returns a promise. If you didn't return a promise explicitly in the function they will be wrapped in a resolved promi...

Two different standards In the browser JavaScript ecosystem, JavaScript modules depends on import and export statements to load and export ES modules. In addition, ES module is the official standard format to package JavaScript code for reuse. On the other ...

Time before OAuth Before OAuth was invented, a common way to give third-party application access to your account is to just provide them your password. This way of allowing third-party application accessing your account information of course have number of pr...

What this certificate covers This certificate proves that you are able to design and implement systems on AWS, the system you designed have high resiliency, have high performance, have good security, and is cost optimized.  

Multi-tier solutions Exam item will require you to understand and implement several aspects across topics. Multi-tier solutions refers a general framework that divides up independently scalable applications components, that can be independently developed, ma...

AWS Lambda Can have a maximum runtime of only 15 minutes. A great option for hosting microservices that does a certain task independently of others. Combine with API Gateway to host the API, they both scale very fast and is great against DDos. Hard to overw...

Elastic vs scalable Although they both mean adapting to dynamic environments they don't really mean the same thing. Scalable means that you are allocating resource expansion on a more persistent level to meet workload growth. Take the example of pizza place,...

Secure resource access Security should be considered at every level, stage, and architecture. The biggest security decision you make early is how the people tool and applications you build will access the necessary AWS resources. It will tell you how to mana...

Cost-effective storage solutions Yous should know which storage service should be used, an object storage, or a file storage and identify the cost optimized storage. Right-size EBS volumes Pick the right size, don't over provision more than you need You ne...

AWS Region and Availability zone An AWS region is a geographical location with a collection of availability zones mapped to a physical data center in that region. Each region operate independent of one of another, they have each of their own power, water supp...

Cloud computing models Infrastructure as a service Offer services that are present in on-premise data center. Servers, storage, and networking hardware, so like VPN are all available as a service in AWS. Ex: EC2, VPC, EBS. Platform as a service AWS helps ...

String substitution In the context of building a database query like so: CREATE TABLE fish (name TEXT, species TEXT, tank_number INTEGER) you would likely want to include for example user input for say a search query into a database. There are two ways to go...

AWS relational database services (RDS) A fully managed database services, makes it easy for you to launch a database servers. You get to choose the different type of database engine from MySQL, MariaDB, PostgresSQL, Oracle, Microsoft SQL Server. AWS Aurora ...

AWS compute services EC2 Allow you to launch on-demand virtual machines. EC2 autoscaling Allow you to dynamically scale EC2 capacity up or down according to conditions you defined. Scale up by launching more EC2 instances, and scale down by terminating EC2...

Management tools CloudFormation Use a text file to define and deploy your infrastructure on AWS. AWS Service Catalog Allow enterprises to look at what type of resources can be deployed to be governance compliant. What is allowed to be deployed on AWS cloud...

Application integration Step functions Make it easy to orchestrate bunch of microservice in a particular order. You define your application visually as series of step and then you can deploy it. Say you only want microservice B to run after microservice A is...

Max-width This property is interesting because if you specify a max-width, the content's width will never exceed the value you have specified. So if you set a <p> tag to a max-width of say 200px, the box-model will never exceed 200 pixels, although the conte...