Contus Interview Questions and Answers

Q1. How node js works
Ans. 
Node.js is a JavaScript runtime that executes code outside a browser, enabling server-side development with non-blocking I/O.
• Node.js uses an event-driven, non-blocking I/O model, making it efficient for handling multiple connections simultaneously.

• It runs on the V8 JavaScript engine, which compiles JavaScript to native machine code for faster execution.

• Node.js operates on a single-threaded event loop, allowing it to ma...read more
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Q2. What is event loop
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The event loop is a core component of Node.js that enables non-blocking I/O operations by managing asynchronous callbacks.
• The event loop allows Node.js to perform non-blocking operations despite being single-threaded.

• It continuously checks the call stack and the message queue to execute tasks.

• When an asynchronous operation completes, its callback is pushed to the message queue.

• The event loop processes the message queue...read more
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Q1. Explaining resume
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Q2. Coding question to print dates of saturday and sunday from month of given input date
Ans. 
This code prints all Saturdays and Sundays for the month of a given date input.
• Use JavaScript's Date object to manipulate dates.

• Extract the month and year from the input date.

• Iterate through the days of the month to find Saturdays (6) and Sundays (0).

• Push the found dates into an array and print them.

• Example input: '2023-10-15' will yield Saturdays and Sundays of October 2023.
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Q1. What is react why it's used?
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React is a JavaScript library for building user interfaces, particularly single-page applications, using a component-based architecture.
• Component-Based Architecture: React allows developers to build encapsulated components that manage their own state, making code reusable and easier to maintain.

• Virtual DOM: React uses a virtual representation of the DOM to optimize rendering, improving performance by minimizing direct ...read more
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Q1. What is virtual DOM in react?
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Virtual DOM is a lightweight representation of the actual DOM in React, enabling efficient updates and rendering.
• The Virtual DOM is a JavaScript object that mirrors the structure of the real DOM.

• When changes occur, React updates the Virtual DOM first, not the real DOM directly.

• React uses a diffing algorithm to compare the Virtual DOM with the real DOM, identifying changes.

• Only the parts of the real DOM that have change...read more
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Filter and shot the filter block based on title using redux?

Give 10 questions from node js backend

Q1. Ask about angular and node js
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Q2. What is package.json
Ans. 
package.json is a file used in Node.js projects to manage dependencies, scripts, and metadata.
• It is a JSON file that contains information about the project, such as name, version, dependencies, and scripts.

• It is used to manage project dependencies by listing them in the 'dependencies' and 'devDependencies' fields.

• It allows developers to define scripts for tasks like building, testing, and running the project.

• Example: {...read more
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Q3. What is components in angular,how share data to component
Ans. 
Components in Angular are building blocks of an application. Data can be shared between components using input properties and output events.
• Components in Angular are reusable, self-contained units of code that define a part of the user interface.

• Data can be shared to a component using input properties, where data is passed from the parent component to the child component.

• Data can also be shared from a child component t...read more
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Q4. What is === and == ,and wher use === is real time projects
Ans. 
=== is strict equality operator, while == is loose equality operator. === is commonly used in real-time projects for accurate comparisons.
• === is a strict equality operator that checks both value and type of operands

• == is a loose equality operator that only checks the value of operands

• === is commonly used in real-time projects to ensure accurate comparisons and prevent unexpected type coercion issues
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Q5. Write arrow function syntax
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Arrow function syntax in JavaScript
• Arrow functions are concise syntax for writing function expressions in JavaScript

• They have a shorter syntax compared to traditional function expressions

• They do not have their own 'this', 'arguments', 'super', or 'new.target' keywords
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Q6. What is difference between arrow function and anonymous function
Ans. 
Arrow functions are concise syntax for writing function expressions, while anonymous functions do not have a name.
• Arrow functions have a shorter syntax compared to anonymous functions.

• Arrow functions do not have their own 'this' keyword, while anonymous functions do.

• Arrow functions do not have 'arguments' object, while anonymous functions do.

• Arrow functions are not hoisted, while anonymous functions are hoisted.
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Q1. Business analysis tools and techniques
Ans. 
Business analysis tools and techniques are essential for gathering, analyzing, and documenting business requirements.
• Use tools like Microsoft Excel, Visio, and Jira for data analysis and visualization

• Techniques such as SWOT analysis, PESTLE analysis, and stakeholder interviews help in understanding business needs

• Utilize tools like BPMN, UML, and user stories for process modeling and requirement documentation
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Q1. Busienss system analysis and process improvements and scenario based questions
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