FirstWire Apps Interview Questions and Answers

OOP (Object-Oriented Programming) is a programming paradigm based on objects that encapsulate data and behavior.

• Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).

• Inheritance: Mechanism to create a new class from an existing class, inheriting its properties (e.g., a 'Dog' class inheriting from an 'Animal' class).

• Polymorphism: Ability to present the same interface for diffe...read more

A stack is a linear data structure that follows the Last In First Out (LIFO) principle for managing data.

• Elements are added and removed from the top of the stack.

• Common operations include push (adding) and pop (removing) elements.

• Used in function call management, expression evaluation, and backtracking algorithms.

• Example: Undo functionality in text editors uses a stack to keep track of changes.

A circular linked list is a data structure where the last node points back to the first, forming a loop.

• Consists of nodes, each containing data and a reference to the next node.

• The last node's next reference points to the first node, creating a circular structure.

• Useful for applications requiring continuous traversal, like round-robin scheduling.

• Example: In a circular queue, elements can be added and removed in a circu...read more

JavaScript is a versatile, high-level programming language primarily used for web development to create interactive and dynamic content.

• Client-side scripting: JavaScript runs in the user's browser, enabling dynamic content updates without reloading the page. Example: Form validation.

• Event-driven: JavaScript can respond to user actions like clicks, mouse movements, and keyboard inputs. Example: Dropdown menus that expan...read more

OOP (Object-Oriented Programming) is a programming paradigm based on objects and classes, promoting code reusability and modularity.

• Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).

• Inheritance: Mechanism to create a new class from an existing class, inheriting attributes and methods (e.g., a 'Dog' class inheriting from an 'Animal' class).

• Polymorphism: Ability to present ...read more

International SEO optimizes websites for global audiences, enhancing visibility across different countries and languages.

• Use hreflang tags to indicate language and regional targeting, e.g., <link rel='alternate' hreflang='es' href='https://example.com/es/' />.

• Optimize content for local keywords; for instance, 'football' in the UK vs. 'soccer' in the US.

• Create country-specific domains or subdirectories, like examp...read more

Core Web Vitals are essential metrics that measure user experience on websites, focusing on loading, interactivity, and visual stability.

• Largest Contentful Paint (LCP): Measures loading performance. Example: A fast-loading image or video that appears within 2.5 seconds.

• First Input Delay (FID): Measures interactivity. Example: A user can click a button within 100 milliseconds of interaction.

• Cumulative Layout Shift (CLS)...read more