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08 Jan, 2025
Top Node.js Interview Questions
In Node.js, callbacks are functions that are passed as arguments to other functions and are executed after the completion of an asynchronous operation. The callback function is called (or invoked) when the operation finishes, allowing Node.js to handle tasks asynchronously without blocking the main thread. This is an essential concept in Node.js, which is designed around asynchronous I/O to maintain non-blocking performance.
08 Jan, 2025
Top R Interview Questions and Answers
ggplot2 is a popular data visualization package in R that provides a powerful and flexible framework for creating a wide range of static graphics. It is based on the Grammar of Graphics (hence the gg), which provides a systematic approach to building visualizations by layering different components.
08 Jan, 2025
Top R Interview Questions
R is a programming language and software environment primarily used for statistical computing, data analysis, and visualization. It was designed by statisticians and data scientists to handle complex data operations and is widely used in academia, research, and industries like finance, healthcare, marketing, and data science.
08 Jan, 2025
Top R Interview Questions and Answers(2025)
In R, datasets can be merged using the merge() function, which combines two data frames by common columns or row names, similar to SQL joins. You can control how the data frames are merged (e.g., inner, outer, left, or right join) by specifying different options.
08 Jan, 2025
Top React Interview Questions for Developers
The Context API in React is a feature that allows you to share state or other values across your application without having to pass props down manually at every level of the component tree. It provides a way to manage global state and avoid prop drilling, which occurs when you pass data through many layers of components just to reach a deeply nested component.
08 Jan, 2025
Top ReactJS Interview Questions for Developers
A Higher-Order Component (HOC) is a function in React that takes a component and returns a new component with additional functionality. HOCs are a pattern used for reusing component logic. They don't modify the original component directly; instead, they enhance the component by adding extra behavior or props.
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