10+ Johnson Controls Interview Questions and Answers

Create 10 checkboxes in JavaScript and display the count of checked checkboxes below. Update count on unchecking.

• Use JavaScript to create checkboxes

• Add event listener to checkboxes to track changes

• Update count of checked checkboxes on change

• Display count below checkboxes

Call, Apply, and Bind are methods in JavaScript used to manipulate the value of 'this' in a function.

• Call: Invokes a function with a specified 'this' value and arguments provided individually.

• Apply: Invokes a function with a specified 'this' value and arguments provided as an array.

• Bind: Creates a new function with a specified 'this' value and arguments provided as a list.

The figure tag is used to group images and their captions together, while the img tag is used to display a single image.

• Figure tag is used to group images and their captions together.

• Img tag is used to display a single image.

• Figure tag can contain multiple images and text, while img tag is standalone.

• Figure tag is often used for image galleries or diagrams.

• Img tag is used for displaying a single image on a webpage.

webCompliance rules are guidelines that ensure websites meet legal and regulatory requirements. webForm 2.0 is a web development framework.

• webCompliance rules are used to ensure websites adhere to accessibility, privacy, and security standards.

• These rules help websites avoid legal issues and provide a better user experience.

• Examples of webCompliance rules include WCAG (Web Content Accessibility Guidelines) for accessibility and GDPR (General Data Protection Regulation) for pr...read more

A breadcrumb is a navigation element that shows the user's current location within a website or application.

• A breadcrumb typically appears horizontally at the top of a page or below the navigation bar.

• It consists of a series of links, with each link representing a higher-level page or section.

• The last link in the breadcrumb represents the current page or section and is often not clickable.

• Breadcrumb navigation helps users understand their location within a website and provide...read more

Ajax is a technique used to update parts of a web page without reloading the entire page.

• Ajax stands for Asynchronous JavaScript and XML.

• It allows for asynchronous communication between the client and server.

• Ajax uses XMLHttpRequest object to send and receive data from the server.

• It can update the content of a web page dynamically without refreshing the whole page.

• Ajax is commonly used for creating interactive web applications.

Closure is a function that has access to its own scope, the outer function's scope, and the global scope.

• Closure allows a function to access variables from its outer function even after the outer function has finished executing.

• It helps in creating private variables and functions in JavaScript.

• Closures are created every time a function is created, and they store references to the variables in their lexical environment.

• Example: function outer() { var x = 10; function inner() {...read more

JavaScript has some disadvantages that developers should be aware of.

• JavaScript is an interpreted language, which can lead to slower performance compared to compiled languages.

• JavaScript has limited support for multithreading, making it difficult to perform complex tasks efficiently.

• JavaScript can be prone to security vulnerabilities, such as cross-site scripting (XSS) attacks.

• JavaScript code can be difficult to maintain and debug, especially in large-scale applications.

• JavaS...read more

Types of storage in HTML5 include localStorage, sessionStorage, and IndexedDB.

• localStorage: stores data with no expiration date

• sessionStorage: stores data for one session only

• IndexedDB: stores large amounts of structured data

Answering questions related to Hive, Spark, and JSON format.

• Types of partitioning in Hive: static and dynamic

• Bucketing in Hive: used for efficient sampling and joins

• Deduplication in Hive: using DISTINCT keyword or GROUP BY clause

• RDDs and DataFrames: both are distributed collections in Spark, but DataFrames have a schema

• Difference between Spark Session and Context: Session is a higher-level API that includes Context

• Pretty JSON format: using indentation and line breaks for read...read more

OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.

• OOPs focuses on creating objects that interact with each other to solve complex problems

• Key principles include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation involves bundling data and methods that operate on the data into a single unit

• Inheritance allows a class to inherit properties and behavior from another class

• Polymorphism e...read more