Senior Developer Interview Questions and Answers for Freshers

A hash map is a data structure that allows for efficient storage and retrieval of key-value pairs.

• A hash map uses a hash function to convert keys into array indices.

• It provides constant-time average case complexity for insertion, deletion, and retrieval operations.

• Hash maps are commonly used in programming languages and databases for fast data access.

• Example: HashMap map = new HashMap<>();

• map.put("apple", 5);

• int value = map.get("apple"); // returns 5

Arrow functions are concise syntax for writing functions in JavaScript, compared to normal functions.

• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions do not have 'arguments' object.

• Arrow functions cannot be used as constructors.

• Arrow functions are more concise and easier to read compared to normal functions.

A closure is a function that has access to its own scope, as well as the outer scope in which it was defined.

• A closure can access variables from its outer function even after the outer function has finished executing.

• Closures are commonly used in event handlers, callbacks, and asynchronous code.

• Example: const outerFunction = () => { const outerVar = 'I am outer'; return () => { console.log(outerVar); }; }; const innerFunction = outerFunction(); innerFunction(); // Output: 'I ...read more

The company process involves a structured approach to project development and implementation.

• The company follows Agile methodology for project management.

• There are regular stand-up meetings to discuss progress and roadblocks.

• Code reviews are conducted before merging to the main branch.

• Testing is an integral part of the development process.

• Documentation is maintained throughout the project lifecycle.

Dereferencing a null pointer means trying to access the memory location pointed to by a null pointer.

• Dereferencing a null pointer can lead to a segmentation fault or access violation.

• Example: int *ptr = NULL; int value = *ptr; // This will result in a segmentation fault.

Extensive experience with Angular framework for building dynamic web applications.

• Developed multiple single-page applications using Angular

• Strong understanding of Angular concepts like components, services, modules, routing, and forms

• Experience with Angular CLI for project setup and management

• Familiarity with Angular Material for UI components

• Knowledge of state management using NgRx or RxJS

Extensive experience with Java programming language in various projects and applications.

• Developed web applications using Java EE framework

• Utilized Java for backend development in multiple projects

• Experience with Java libraries and frameworks such as Spring and Hibernate