Golang Developer Interview Questions and Answers for Freshers

Types of channels in Go and their use cases

• Buffered channels: Allow multiple senders to send data without blocking until the buffer is full

• Unbuffered channels: Synchronize goroutines by blocking sender until receiver is ready

• Bidirectional channels: Allow both sending and receiving data

• Receive-only channels: Restrict channel to only receive data

• Send-only channels: Restrict channel to only send data

Concurrency is the ability to run multiple tasks simultaneously, achieving parallelism.

• Go uses goroutines to achieve concurrency

• Goroutines are lightweight threads managed by the Go runtime

• Concurrency in Go is achieved using channels for communication between goroutines

Sharding is a database architecture pattern that splits data across multiple servers to improve performance and scalability.

• Identify the sharding key: Choose a key that will determine how data is distributed (e.g., user ID, geographic location).

• Design the shard architecture: Decide on the number of shards and how they will be managed (e.g., horizontal vs. vertical sharding).

• Implement data distribution: Write logic to route queries to the appropriate shard based on the shardin...read more

Scaling a database involves strategies to handle increased load and improve performance, ensuring reliability and efficiency.

• Vertical Scaling: Upgrading hardware (e.g., adding more RAM or CPU) to improve performance.

• Horizontal Scaling: Adding more database instances (e.g., sharding) to distribute load.

• Read Replicas: Creating copies of the database for read-heavy operations to reduce load on the primary database.

• Caching: Implementing caching layers (e.g., Redis, Memcached) to ...read more

Reversing a linked list involves changing the direction of the pointers between nodes.

• 1. Initialize three pointers: prev (null), current (head), and next (null).

• 2. Iterate through the list: while current is not null, do the following:

• a. Set next to current.next to save the next node.

• b. Change current.next to prev to reverse the link.

• c. Move prev to current and current to next.

• 3. Once done, set head to prev, which is the new head of the reversed list.

• Example: For a list 1 -...read more

Use go routines and channels to print numbers 1 to 10

• Create a channel to communicate between go routines

• Use a for loop to create 10 go routines, each printing a number

• Send the numbers through the channel and print them in the main routine

Implement a stack using the given structure.

• Create a struct with an array to store the stack elements and an index to keep track of the top element

• Implement functions like push, pop, and peek to manipulate the stack

• Ensure to handle stack overflow and underflow cases

GOROOT is the root directory where Go is installed, while GOPATH is the workspace directory where Go projects are stored.

• GOROOT is where Go's standard library and tools are located

• GOPATH is where your own Go projects and their dependencies are stored

• You can have multiple GOPATHs to organize different projects