Meteor.js Interview Questions and Answers

05 Dec

Meteor.js Interview Questions and Answers

JavaScript, meteorjs interview questions

Meteor is a free and open-source isomorphic JavaScript web framework written using Node.js. Meteor is used for rapid prototyping and produce cross-platform code for Web, Android, and iOS. As it provides amazing features to build applications, easy to learn and has ample documentation, it became the first choice for modern developers. It integrates with MongoDB and uses the Distributed Data Protocol and publish subscribe pattern to automatically propagate data changes to clients without requiring the developer to write any synchronization code. On the client, Meteor can be used with its own Blaze templating engine, as well as with the Angular framework or React library.

Meteor is developed by the Meteor Development Group. The startup was incubated by Y Combinator] and received $11.2M in funding from Andreessen Horowitz in July 2012.Meteor raised an additional $20M in Series B funding from Matrix Partners, Andreessen Horowitz and Trinity Ventures. It intends to become profitable by offering Galaxy, an enterprise-grade hosting environment for Meteor applications. (Source :wiki Pedia)

What is Meteor?

Meteor or Metor.js is an open source full stack JavaScript (JS) framework, made up of a collection of libraries and packages, bound together. But some people call Meteor magic. Meteor includes a key set of technologies for building connected-client reactive applications, a build tool, and a curated set of packages from the Node.js and general JavaScript community. It was released in December 2011 following the name Skybreak but in April 2012 it was officially launched official as Meteor.

Why Meteor?

Meteor is a full-stack, highly opinionated MVC framework for Node.js that’s a little less flexible than a more lightweight framework like ExpressJS. If you’re working with a MEAN stack, bringing Meteor into your software stack is going to help you accelerate the development of iOS, Android, and web applications. Meteor is a game-changing framework for rapid software development. By using JavaScript on the front and back-end, Meteor allows you to build faster. Meteor is easy to learn and quick to build with—making it a new favorite for many developers. Meteor JS delivers an absolute solution for producing and deploying web apps. Considering the features provided by Meteor JS, you can understand how beneficial it could be to use Meteor JS in developing apps. It is also steadily growing and becoming more helpful to build real-time applications.

What are the features of Meteor?

Development ecosystem
Full stack solution
Nested imports
Front-end reactivity: Automatic CSS & JS minification and reactive templates
Meteor JS allows to develop and deploy Android and iOS apps through Cordova PhoneGap alliance
It has efficient cloud platform ‘Galaxy’ which is very useful to deploy and monitor client applications
The dependency on a server for to update the app is ended as it instantly updates without interrupting the app users
It performs the updating automatically when any changes created in data of a database
Database Integration

Can you explain Meteor templates?

Meteor templates are using three top level tags. The first two are head and body. These tags perform the same functions as in regular HTML. The third tag is template. This is the place, where we connect HTML to JavaScript. (Head and body tag has same function as in regular HTML, but template tag is used to connect HTML to JavaScript)

Can you explain Meteor session?

Session provides a global object on the client that you can use to store an arbitrary set of key-value pairs. Use it to store things like the currently selected item in a list.If you call Session.get(‘currentList’) from inside a template, the template will automatically be rerendered whenever Session.set(‘currentList’, x) is called.

Explain Random package in Meteor?

In Meteor, It provides several functions for generating random numbers. It uses a cryptographically strong pseudorandom number generator when possible but falls back to a weaker random number generator when cryptographically strong randomness is not available (on older browsers or on servers that don’t have enough entropy to seed the cryptographically strong generator).

id
secret
fraction
choice
hexString

What is server render package in Meteor?

In Meteor, This Server render package implements generic support for server-side rendering in Meteor apps, by providing a mechanism for injecting fragments of HTML into the <head> and/or <body> of the application’s initial HTML response. This package exports a function named onPageLoad which takes a callback function that will be called at page load (on the client) or whenever a new request happens (on the server).

What is underscore package in Meteor?

In Meteor, this is a utility-belt library for JavaScript that provides support for functional programming. It is invaluable for writing clear, concise JavaScript in a functional style. The underscore package defines the _ namespace on both the client and the server.

What is webapp package in Meteor?

In Meteor, this is what lets your Meteor app serve content to a web browser. It is included in the meteor-base set of packages that is automatically added when you run meteor create. You can easily build a Meteor app without it – for example if you wanted to make a command-line tool that still used the Meteor package system and DDP.This package also allows you to add handlers for HTTP requests. This lets other services access your app’s data through an HTTP API, allowing it to easily interoperate with tools and frameworks that don’t yet support DDP.

Webapp exposes the connect API for handling requests through WebApp.connectHandlers.

What is Meteor deployment?

Meteor deployment is easy because Meteor is not just a framework but it’s a platform which takes care of the whole development process from creating application to deploy. One of the great things about Meteor is how easy is to deploy the app. Once your app is completed, there is an easy way to share it with the world. All you have to do is run the following code in the command prompt window.

C:\Users\username\Desktop\meteorApp>meteor deploy my-first-app-ever.meteor.com

You will be asked to enter Meteor developers account username and password.

What is Blaze in Meteor?

In Meteor, Blaze is a Meteor package used for building live reactive templates.

What is Meteor EJSON?

In Meteor, EJSON is an extension of JSON syntax that supports Date and Binary types. The date and binary can be desterilize using the parse method.

What are the Command Lines in Meteor?

Command Lines are:

meteor help and meteor run
meteor debug and meteor list
meteor create name and meteor login / logout
meteor deploy site and meteor update
meteor add package and meteor remove package
meteor add-platform platform and meteor remove-platform platform
meteor list-platforms
meteor mongo
meteor reset and meteor build
meteor lint and meteor search
meteor show and meteor publish
meteor publish-for-arch and meteor publish-release
meteor test-packages and meteor admin
meteor shell and meteor npm
meteor node

What are the Environment Variables in Meteor?

BIND_IP
DISABLE_WEBSOCKETS
HTTP_FORWARDED_COUNT
MAIL_URL
METEOR_SETTINGS
MONGO_OPLOG_URL
MONGO_URL
METEOR_PACKAGE_DIRS
PORT
ROOT_URL (for more information see Metero blog))

How does hot code push work with the app store?

Hot code pushes are loaded by client devices, e.g. phones, in the background while the app continues to run. Once the new code has been fully loaded, the device is able to switch over to the new code quickly. This reduces or in some cases entirely eliminates the need to update code via the App Store and Google Play.

How can Meteor provide security for mobile or web application?

Meteor offers large number of packages for application development. Developer need to remove some insecure or less secure packages while development. Another way to provide security of application is that, creating your methods on the server. This can be done by using the Meteor.methods() on the server and Meteor.call() on the client.

Can I use a database other than mongodb with meteor?

Currently MongoDB is the only database that is officially supported with Meteor. We are listening closely to the frequent requests to support other kinds of databases.

What are the benefits of Meteor?

Simplicity
Easy to Learn
Real Time Web Development
Develop With a Single Language
Abundance of Packages and Libraries
Simplified for Developers
Easy To Learn js
Dedicated development teams
Seamless Client-Server Communication
Meteor Framework Is Easy To Set Up
Useful Meteor.js Resources
Real-time Testing Tool of Lean Products
Meteor Framework for Native Mobile Apps
Project Scalability
Large and Helpful Community
js is the best Framework of the Future

What makes meteor different from JavaScript frameworks like angular or react?

It is a full-stack JavaScript App Platform that assembles all the pieces you need to build modern web and mobile apps, with a single JavaScript codebase. Angular and React are JavaScript UI frameworks that can be used in conjunction with Meteor, as an alternative to Meteor’s Blaze library. Think of Angular, React, and Blaze as the ‘V’ in MVC. Meteor automatically manages the data flow between cloud and client applications, as well as client UI state and rendering, regardless of which UI framework you use.

What are cons of Meteor?

It isn’t very suitable for large and complex applications.
Only MongoDB Support
Native Widget Library
Network Connection Flexibility
No model/object form binding
Rendering on the Server Side
Inbuilt Support for PWA

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