Top 100 Questions for Go Developers

Junior-Level Questions

• What makes Go different from languages like Python or Java?
• Why doesnt Go have a while loop and how do you replicate it?
• Whats the purpose of the main function in a Go program?
• How does Gos short declaration differ from var?
• What happens if you forget to capitalize an exported function name?
• Why cant you change a string character directly in Go?
• Whats the difference between a slice and an array?
• How does Go handle errors compared to try-catch in other languages?
• Why does Go use fmt instead of just printing to the console?
• Whats the zero value of an int string and slice?
• How do you initialize a map in Go?
• Whats the role of the defer keyword?
• Why doesnt Go support traditional inheritance?
• How can you tell if a variable is uninitialized in Go?
• Whats the difference between make and new?
• Why are pointers useful in Go?
• How do you declare a constant in Go and what types can it have?
• What happens if you pass a slice to a function does it copy?
• Why does Go enforce a single way to format code with gofmt?
• Whats the simplest way to read user input in Go?
• How does Gos if statement differ from Cs?
• Whats a package in Go and why do you need them?
• Why doesnt Go have a ternary operator like?
• How do you loop over a slice using range?
• Whats the purpose of the blank identifier?
• How do you handle multiple return values from a function?
• Why cant you compare two slices with?
• Whats the difference between a buffered and unbuffered channel?
• How does Gos init function work and when is it called?
• Whats the easiest way to concatenate strings in Go?
• Why does Go use iota for constants?
• How do you check if a key exists in a map?

Intermediate-Level Questions

• How do goroutines differ from operating system threads?
• Whats the simplest way to start a goroutine?
• How does a channel help goroutines communicate?
• Whats a race condition and how can Go detect it?
• Why does Go prefer composition over inheritance?
• How do you implement an interface in Go implicitly?
• Whats the benefit of using a struct over a map?
• How does select work with multiple channels?
• What happens if you write to a closed channel?
• How can you limit the number of goroutines running at once?
• Whats the difference between panic and returning an error?
• How does recover catch a panic and where should you use it?
• Why is nil a valid value for a slice but not an array?
• How do you deep copy a struct in Go?
• Whats the purpose of the context package?
• How do you cancel a long-running goroutine?
• Why does Go avoid exceptions in favor of explicit errors?
• How can you profile a Go programs performance?
• Whats the difference between append and copy for slices?
• How do you handle JSON encoding and decoding in Go?
• Whats a closure in Go and how might you use it?
• How does Gos garbage collector impact performance?
• Why doesnt Go support method overloading?
• How do you test a function in Go using the testing package?
• Whats the significance of GOPATH vs GOROOT?
• How do you handle timeouts with channels?
• Whats the difference between a pointer receiver and a value receiver?
• How can you safely share data between goroutines?
• Why does Go use a single-threaded scheduler by default?
• How do you handle dependencies in a Go project?
• Whats the benefit of using sync-Mutex over channels?
• How does runtime-Gosched affect goroutine execution?
• Whats the easiest way to parse command-line flags in Go?

Senior-Level Questions

• How does Gos scheduler manage thousands of goroutines efficiently?
• Whats the internal structure of a channel in Go?
• How do you optimize memory usage in a high-throughput Go app?
• Why does Gos garbage collector run concurrently with the program?
• How would you design a rate limiter using Go?
• Whats the trade-off between buffered and unbuffered channels?
• How does Go handle stack growth for goroutines?
• Whats the purpose of runtime-GOMAXPROCS?
• How do you avoid data races without using locks?
• Whats the benefit of using sync-Pool in a Go application?
• How would you implement a worker pool with goroutines?
• Why does Gos map type not guarantee order?
• How do you benchmark a function in Go?
• Whats the role of the unsafe package and when is it justified?
• How does Gos type system differ from traditional OOP languages?
• What impact does cgo have on Gos performance?
• How do you handle graceful shutdowns in a Go server?
• Why might you use atomic operations instead of a mutex?
• How would you sort a 100gb file with 1gb of RAM in Go?
• Whats the difference between shallow and deep copies in Go?
• How does Gos context-WithTimeout work under the hood?
• Whats the best way to handle concurrent writes to a map?
• How do you debug a deadlock in a Go program?
• Why doesnt Go support tail-call optimization?
• How would you implement a custom error type in Go?
• Whats the advantage of using interface sparingly?
• How does Gos net-http package handle connection pooling?
• Whats the role of the sync-Once type?
• How do you tune Gos garbage collector for low latency?
• Whats the difference between go test and go run?
• How would you build a distributed system with Go?
• Why does Go avoid generics and how has this evolved?
• How do you ensure thread safety in a Go library?