Appasamy Associates Software Developer Interview Questions and Answers

To find code performance issues in production, use monitoring tools and profiling techniques.

• Use monitoring tools like New Relic, AppDynamics, or Datadog to track performance metrics and identify bottlenecks.

• Use profiling techniques like CPU profiling, memory profiling, and network profiling to pinpoint specific areas of the code that are causing performance issues.

• Analyze logs and error messages to identify patterns a...read more

Asynchronous programming is a programming paradigm that allows multiple tasks to run concurrently without blocking each other.

• Asynchronous programming is used to improve the performance of applications that require a lot of I/O operations.

• It involves the use of callbacks, promises, and async/await keywords in JavaScript.

• Asynchronous programming can be used in both front-end and back-end development.

• Examples of asynchro...read more

Program to change background color on button click in Angular

• Create a button in Angular template

• Add click event listener to the button

• Use setInterval() function to change background color after every 0.5 sec

• Use ngStyle directive to change background color dynamically

Use Angular's 'resolve' property to load component after services are loaded.

• Create a resolver service that waits for all three services to complete before resolving.

• Add the resolver service to the 'resolve' property of the component's route.

• Access the resolved data in the component using the ActivatedRoute service.

• Example: { path: 'my-component', component: MyComponent, resolve: { data: MyResolverService } }

IQueryable is for querying data from a source that implements IQueryable interface while IEnumerable is for iterating over a collection of data.

• IQueryable is used for deferred execution while IEnumerable is used for immediate execution.

• IQueryable is used for querying data from a remote data source while IEnumerable is used for querying data from an in-memory collection.

• IQueryable is more efficient for large datasets as...read more

Entity Framework is an ORM while ADO.NET is a data access technology.

• Entity Framework is easier to use and provides more abstraction than ADO.NET.

• ADO.NET is faster and more flexible than Entity Framework.

• Use Entity Framework for simple CRUD operations and ADO.NET for complex queries and performance-critical applications.

Find the second largest number in an array.

• Sort the array in descending order

• Return the element at index 1

Program to add two numbers without using the '+' operator.

• Use bitwise operators like XOR and AND to perform addition without '+' operator.

• XOR the two numbers to get the sum without carry.

• AND the two numbers and left shift the result to get the carry.

• Repeat the process until carry becomes zero.

Mutable data types can be modified after creation, while immutable data types cannot be modified.

• Examples of mutable data types: lists, sets, dictionaries

• Examples of immutable data types: strings, tuples, frozensets

A dictionary is an unordered collection of key-value pairs, while a list is an ordered collection of elements.

• Dictionaries are accessed by keys, while lists are accessed by indices.

• Dictionaries are mutable, while tuples are immutable.

• Dictionaries can have duplicate values, but not duplicate keys.

• Lists can contain elements of different data types, while tuples can contain elements of the same or different data types.

Yes, a dictionary is mutable in Python.

• A dictionary in Python can be modified by adding, updating, or deleting key-value pairs.

• The values associated with keys in a dictionary can be changed.

• Dictionaries are mutable objects, meaning they can be modified in-place.

• The 'update()' method can be used to add or update multiple key-value pairs at once.

A program to determine if a number is prime or not.

• A prime number is a number greater than 1 that has no positive divisors other than 1 and itself.

• To check if a number is prime, iterate from 2 to the square root of the number and check if any of them divides the number evenly.

• If any divisor is found, the number is not prime. Otherwise, it is prime.