![]() ![]() You are not expected to know it all, but awareness of all aspects of application development is mandatory. These questions provide an overview of what questions you can expect during an intermediate full-stack developer position interview. When the upgrade is done, you swap the environments, redirecting traffic from the blue to the green environment. Both these environments share the same app configurations, database, and backend. The blue environment is the one that receives all the user traffic running the production environment while the green environment is the one that you will upgrade. In blue-green deployment, there exist two identical production environments in parallel. In this process, system upgrade takes a while and both old and new versions will coexist without affecting user experience or functionality. How rolling deployment differs from blue-green deployment?Ī rolling development involves replacing an application version gradually with a newer version. ![]() Other possible solutions can be blocking requests based on the user agent string or generating temporary “session” access tokens at the front end. When the specified number of requests is reached, it will throw a ‘429 Too Many Attempts HTTP error’. Rate-limiting or throttling is one such measure that can prevent a specific device from making too many requests within a defined time. However, some measures can be taken to deter most bots. It is not entirely possible to prevent data scraping if the data within the API is publicly accessible. How can you prevent a bot from scraping a publicly accessible API? ![]() It achieves so by offloading operations to the system kernel whenever possible. What’s an Event Loop?Įvent loop is a function that allows Node.js to perform non-blocking I/O operations even when JavaScript is single-threaded. We are deleting foo property from a self-invoking function and in the next call (return x.foo ) trying to reference the deleted property “foo”, this will result undefined. In this example, x is the object with foo as a property. delete operator is used to delete a property from an object. The result of the above code will be the output. What will be the output of the following code? If you are developing large-scale projects, MySQL or commercial Oracle as the back-end database is recommended. While for performance improvement, memory databases such as Redis can be used. How can you categorize databases?Īs a full-stack developer, you need to be familiar with two or more databases.Īs a document-type database, MongoDB is the most widely used for internet products. Simply put, Two-phase Commit (2PC) keeps databases synchronized. This feature enables databases to return to their pre-transaction state if an error condition occurs. Two-phase Commit (2PC) is an atomic process that ensures that in a transaction processing system either all the databases are updated or none of them is updated. What is Two-phase Commit (2PC) in the database? JQuery is a JS library that was built to automate common JavaScript tasks like AJAX and simplify the language.Ħ.AJAX is a way for JavaScript to run a function or request data from a server without blocking an application or refreshing a page.Nodejs allows an application to run JavaScript without a browser.What is the difference between Nodejs, AJAX, And JQuery? Normalizing CSS makes integrated browser styling in the code consistent across all browsers.Also, there are no bug fixes in resetting. Resetting CSS removes all the built-in browser styling.Explain the difference between “resetting” and “normalizing” CSS? While the former is used for executing queries with existing data, REST defines a set of constraints for creating Web services. GraphQL is an application layer server-side technology while REST is a software architectural style. What is the main difference between REST and GraphQL? There can only be one component in one element, while one element can have multiple directives. What is the difference between a directive and a component?ĭirectives are added to an existing component, while components have their own view i.e., HTML and Styles. The stack is named after four technologies that make up the layers of the stack: The MEAN stack is a JavaScript-based framework for developing web applications. How rolling deployment differs from blue-green deployment? What is the difference between a directive and a component? ![]()
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