DMart Interview Questions and Answers

Event loop is a mechanism in programming that allows for asynchronous execution of code.

• Event loop is commonly used in JavaScript to handle asynchronous operations.

• It allows for non-blocking I/O operations by continuously checking the event queue for tasks to execute.

• Event loop helps in managing callbacks and promises in an efficient manner.

• Example: In Node.js, the event loop is responsible for handling incoming requests and executing callbacks.

Linear feet is a measure of length while square feet is a measure of area. Conversion depends on the width of the object.

• To convert linear feet to square feet, you need to know the width of the object in feet.

• Multiply the length in feet by the width in feet to get the area in square feet.

• For example, if you have a 10-foot long board that is 1 foot wide, the area would be 10 square feet.

Linear feet is a measurement of length in a straight line.

• Linear feet is used to measure the length of a straight line, such as a wall or a fence.

• It is calculated by measuring the length in feet and inches and adding them together.

• For example, a wall that is 8 feet long and 6 inches wide would be 8.5 linear feet.

• Linear feet is often used in construction and woodworking to determine the amount of material needed for a project.

Browsers interpret HTML, CSS, and JavaScript to display web pages to users.

• Browsers receive HTML, CSS, and JavaScript files from a web server.

• The browser parses the HTML to create the Document Object Model (DOM).

• CSS is used to style the DOM elements, while JavaScript adds interactivity.

• The browser then renders the final web page for the user to view.

SQL databases are relational databases that use structured query language, while NoSQL databases are non-relational databases that do not use SQL.

• SQL databases are table-based and have a predefined schema, making them suitable for complex queries and transactions.

• NoSQL databases are document-based, key-value pairs, graph databases, or wide-column stores, making them more flexible for unstructured data.

• Examples of SQL databases include MySQL, PostgreSQL, and Oracle, while exam...read more