Indian Educational Services Web Developer Interview Questions and Answers

Hoisting in JS is the behavior where variable and function declarations are moved to the top of their containing scope during the compilation phase.

• Variable declarations are hoisted but not their initializations.

• Function declarations are fully hoisted, meaning they can be called before they are declared.

• Hoisting can lead to unexpected behavior if not understood properly.

Virtual DOM is a lightweight copy of the actual DOM that allows for efficient updates and rendering in web development.

• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing direct manipulation of the actual DOM.

• When changes are made to the Virtual DOM, a comparison is done with the actual DOM to identify the minimal updates needed for rendering.

• This process helps in reducing the nu...read more