Neerx Technovation Interview Questions and Answers

var, let, and const are keywords used to declare variables in JavaScript.

• var is function-scoped and can be redeclared and reassigned

• let is block-scoped and can be reassigned but not redeclared

• const is block-scoped and cannot be reassigned or redeclared

Closure is a feature in JavaScript that allows a function to access variables from its outer scope even after the function has finished executing.

• Closure is created when a function is defined inside another function.

• The inner function has access to the variables and parameters of the outer function.

• The inner function can still access the variables even after the outer function has returned.

• Closure is useful for creatin...read more

Hoisting is a JavaScript behavior where variable and function declarations are moved to the top of their scope.

• Variable declarations are hoisted but not their initializations.

• Function declarations are fully hoisted.

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

The box model in CSS defines the design and layout of elements on a webpage by breaking them down into content, padding, border, and margin.

• The box model consists of content, padding, border, and margin around an element

• Content is the actual content of the element

• Padding is the space between the content and the border

• Border is the line that goes around the padding

• Margin is the space outside the border

Padding is the space inside an element, while margin is the space outside an element.

• Padding is used to create space between the content and the border of an element.

• Margin is used to create space between elements or between an element and its parent or sibling elements.

• Padding affects the size of the content area, while margin affects the positioning of the element.

• Padding can be set individually for each side (top, r...read more

ES6 introduces new syntax and features for JavaScript, enhancing code readability and functionality.

• Arrow Functions: Shorter syntax for function expressions. Example: const add = (a, b) => a + b;

• Template Literals: Multi-line strings and string interpolation. Example: const greeting = `Hello, ${name}!`;

• Destructuring Assignment: Unpacking values from arrays or properties from objects. Example: const [a, b] = [1, 2];

• De...read more