Technical Test

Technical Test

html/css

Box Model

The CSS box model is essentially a box that wraps around every HTML element. It consists of: margins, borders, padding, and the actual content.

js

What is a dependency injection?

DI is a pattern where, instead of creating or requiring dependencies directly inside a module, we pass them as parameters or reference.

architecture/design

MEAN Stack

MEAN (MongoDB, Express.js, AngularJS (or Angular), and Node.js)

REST vs GraphQL

GraphQL Advantages

No more Over- and Underfetching. In GraphQL, you specify exactly what you need. REST, requires multiple requests and API reflects UI. When UI changes, over/under fetching the API occurs.

• GraphQL can decouple frontend from backend.
• API evolution is possible without versioning.
• It is statically typed, so you do not need to define variable before using it.
• No over or under fetching of data.
• It is language and HTTP agnostic.
• Documentation of GraqphQL comes with no extra cost.
• It helps you to save bandwidth.

GraphQL Disadvantages

• GraphQL uses a single endpoint instead of following the HTTP caching.
• Adds complexity / overkill for small applications

REST Advantages

industry standard for companies deploying APIs

• Services of REST can be scaled to achieve high performance to span client demand.
• The API of REST can be served from more than one server.
• REST allows you to store frequently used information in the memory.
• REST has a uniform interface.
• Resources can be easily accessed by name.
• Database resource in an application can be quickly mapped with a REST API endpoint.
• It has a simple architecture and pattern.

REST Disadvantages

• If you have to retrieve any data from two endpoints, you need to send two separate requests to API.
• There is no way to get limited fields.

general programming

What is CI/CD?

CICD is the combined practices of continuous integration and continuous delivery or continuous deployment. CI/CD bridges the gaps between development and operation activities and teams by enforcing automation in building, testing and deployment of applications.

TDD/Unit Tests/FIRST

FIRST properties of Unit Tests. http://agileinaflash.blogspot.com/2009/02/red-green-refactor.html

• Fast: unit test must be fast - A software project will eventually have tens of thousands of unit tests, and team members need to run them all every minute or so without guilt.
• Isolated: Tests isolate failures. A good unit test has a laser-tight focus on a single effect or decision. Good tests interferes with no other tests in any way. They impose their initial state without aid from other tests. They clean up after themselves.
• Repeatable: Tests must be able to be run repeatedly without intervention.
• Self-validating: Tests are pass-fail.
• Timely: Tests are written at the right time, immediately before the code that makes the tests pass.

TDD: Red/Green/Refactor

http://agileinaflash.blogspot.com/2009/02/red-green-refactor.html

• Red: Failed test
• Green: Passed test
• Refactor: Clean up. Remove code. make into smaller units. performance.

Types of Tests

• Unit Tests - small. quick. Jest/NUnit/PHPUnit
• Integration Tests - connect components to see how they work together. Slower to write/run.
• Automation Tests - UI test/end-to-end tests. simulate user behavior. Nightmare (https://github.com/segmentio/nightmare).