GAMMON INDIA Interview Questions and Answers

The filter method is a built-in JavaScript method used to create a new array with all elements that pass a certain condition.

• Filter method is more concise and readable compared to for loop

• Filter method is more declarative and functional programming oriented

• Example: const numbers = [1, 2, 3, 4, 5]; const evenNumbers = numbers.filter(num => num % 2 === 0);

• Example: const words = ['hello', 'world', 'example']; const shortWords = words.filter(word => word.length < 6);

No, it is not optimal to use redux for single state

• Redux is typically used for managing complex state across multiple components

• Using redux for a single state can add unnecessary complexity to the codebase

• Consider using React's built-in state management for simpler cases

Websocket i.o is a JavaScript library that enables real-time, bidirectional and event-based communication between the browser and the server.

• Allows for real-time communication between client and server

• Enables bidirectional data transfer

• Supports event-based communication

• Used for applications requiring real-time updates like chat applications, online gaming, live tracking, etc.

SCSS is a preprocessor scripting language that is a superset of CSS, adding features like variables, nesting, and mixins.

• Variables allow for reusable values throughout a stylesheet

• Nesting helps to keep styles organized and easier to read

• Mixins allow for reusable blocks of styles to be included in other selectors

• SCSS supports operations like math calculations and functions

• SCSS can be compiled into regular CSS for use in web development

I am motivated to join ProtocolZone because of their innovative projects and collaborative team environment.

• Exciting projects at ProtocolZone

• Collaborative team environment

• Opportunity for growth and learning

• Alignment with company values and mission

Redux is a predictable state container for JavaScript apps. It helps manage the state of your application in a more organized way.

• Redux is typically used in large-scale applications with complex state management needs

• It helps in maintaining a single source of truth for the state of your application

• Redux works well with React, but can be used with any other JavaScript framework or library

• Actions are dispatched to update the state in a predictable way

forIn loop iterates over the enumerable properties of an object, while forOf loop iterates over the values of an iterable object.

• forIn loop is used for iterating over object properties, while forOf loop is used for iterating over array elements.

• forIn loop can be used with objects, while forOf loop can be used with arrays, strings, maps, sets, etc.

• Example: forIn loop - for (let key in object) { console.log(key); }

• Example: forOf loop - for (let value of array) { console.log(val...read more

Multicollinear behavior in independent variables occurs when two or more independent variables in a regression model are highly correlated with each other.

• Multicollinearity can lead to unstable estimates of the coefficients in a regression model.

• It can make it difficult to determine the individual effect of each independent variable on the dependent variable.

• Common indicators of multicollinearity include high correlation coefficients between independent variables and high var...read more