ReactJS and MongoDB Quiz

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Questions and Answers

What is the use of preventDefault?

preventDefault is a method in JavaScript that stops the default behavior of an event from happening. It is commonly used in event handling, such as in forms and anchor tags, to prevent the default action from occurring.

Explain ReactJS in your own words.

ReactJS is a JavaScript library used for building user interfaces. It emphasizes the creation of reusable UI components that efficiently update in response to data changes. It is known for its virtual DOM and one-way data flow.

Define Sharding.

Sharding is a database partitioning technique that horizontally divides large databases into smaller, more manageable parts called shards. This helps distribute data across multiple servers, improving performance and scalability.

Define Replication.

Replication is the process of creating and maintaining multiple copies of the same data across different servers. It provides fault tolerance, data redundancy, and load balancing in distributed systems. Signup and view all the answers

Match the following terms with their definitions:

ReactJS = JavaScript library for building user interfaces React keys = Unique identifiers for elements in arrays Mongoose in MongoDB = An ODM library for MongoDB and Node.js JIT compiler = Just-In-Time compiler for converting bytecode into native machine code Signup and view all the answers

Define JIT compiler.

JIT (Just-In-Time) compiler is a type of compiler that dynamically compiles and executes code at runtime, rather than translating the entire program before execution. It is commonly used in languages like Java and .NET to improve performance. Signup and view all the answers

Match the following ASP.NET concepts with their descriptions:

Querystring = Used to pass data between pages in the URL Session state = Stores information specific to a user session on the server Control state = Stores information about the state of a control across postbacks View state = Stores information about the state of a page and its controls across postbacks Signup and view all the answers

Match the following .NET concepts with their explanations:

CLS = Common Language Specification defines a set of rules that language compilers must follow to generate code that can be executed by the .NET runtime Namespaces = Used to organize code elements and to create globally unique types ItemTemplate = Specifies the layout for the items in a control AlternatingItemTemplate = Specifies the layout for every other item in a control Signup and view all the answers

Match the following MongoDB and RDBMS concepts:

Sharding = Horizontal partitioning of data across multiple machines Replication = Process of synchronizing data across multiple servers NoSQL Database = Non-relational database that provides a mechanism for storage and retrieval of data Keywords in MongoDB and RDBMS = e.g. MongoDB: Document, Collection, Field, RDBMS: Table, Row, Column Signup and view all the answers

Match the following React Router and React concepts:

Components in React Router = Route, Link, BrowserRouter, Switch When to use getInitialState method = Prior to ES6, used to initialize state in React components Dumb component = React component that doesn't manage state, only receives props PreventDefault = Method to stop the default action of an event from occurring Signup and view all the answers

Study Notes

ReactJS

ReactJS is a JavaScript library for building user interfaces, focusing on creating reusable UI components that efficiently update in response.

React Router

Components in React Router include: BrowserRouter, Route, Switch, Link, NavLink, Redirect, and Prompt.

React

React should be used when building reusable UI components that efficiently update in response.
React Keys are used to keep track of elements in a list, helping React to update the correct element when the list changes.

DOM Events

preventDefault is used to prevent the default action of an event, allowing for custom event handling.

React Components

A dumb component is a component that only receives props and does not have its own state.

React Lifecycle Methods

getInitialState method is used to set the initial state of a component.

NoSQL Database

NoSQL Database is a type of database that does not use the traditional table-based relational model used in relational databases.

MongoDB

Four keywords used in MongoDB along with equivalent RDBMS keywords are:
- find (SELECT)
- update (UPDATE)
- insert (INSERT)
- remove (DELETE)

MongoDB Sharding

Sharding is a method of horizontal partitioning in a database, where data is split across multiple servers to improve performance.

MongoDB Replication

Replication is a process of creating multiple copies of data in a database, improving data availability and redundancy.

Mongoose

Mongoose is an Object Data Modeling (ODM) library for MongoDB, providing a simple and intuitive way to interact with MongoDB.

Compiler

JIT (Just-In-Time) compiler is a compiler that translates code at runtime, rather than during the development phase.

.NET Comments

In .NET, comments are used to add notes to code, and can be single-line (//) or multi-line (/* */).

.NET CLS

CLS (Common Language Specification) is a set of rules and constraints that ensure language interoperability in .NET.

.NET Namespaces

Namespaces are used to organize and group related classes and other types in .NET, providing a way to avoid naming conflicts.

ASP.NET Templates

ItemTemplate is used to display a template for each item in a data-bound control, while AlternatingItemTemplate is used to display a different template for alternating items.

QueryString

QueryString is a part of a URL that contains data to be passed to a web application, example: <a href="http://example.com?name=John&age=30">http://example.com?name=John&age=30</a>.

ASP.NET Session State

Session State is used to store data specific to a user session, example: Session["username"] = "John";.

ASP.NET Control State

Control State is used to store data specific to a control, allowing it to maintain its state across postbacks.

ADO.NET Connection String

The syntax for setting a connection string in ADO.NET is: ConnectionString="Server=myServer;Database=myDatabase;User ID=myUser;Password=myPassword;".

ASP.NET ViewState

ViewState is a mechanism that allows ASP.NET to store data in a web form, allowing it to maintain its state across postbacks.

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Description

Test your knowledge of ReactJS, React Router, React keys, NoSQL databases, MongoDB, sharding, and replication with this comprehensive quiz.