GO Programming MCQ Questions

Have a cmd directory with a subdirectory per executable. Each subdirectory contains a main.go with its own main() function, enabling multiple binaries from one project.

Use strings.NewReader(data) to create an io.Reader from the string. HTTP Post requires an io.Reader for the request body, which NewReader provides.

Multiple tags tightly couple different layers of your application. Mixing JSON, database, and validation tags in one struct makes it harder to maintain separation of concerns.

go fmt.Println("Hello Gopher!") starts a goroutine. The 'go' keyword before a function call executes it concurrently in a new goroutine.

Time.Add() accepts Duration and returns Time; Time.Sub() accepts Time and returns Duration. Add advances time forward, Sub calculates the difference between two times.

A channel is a medium for sending values between goroutines. Channels provide synchronized communication, allowing goroutines to safely share data without explicit locks.

Select executes different cases based on which channel returns first. It's used for concurrent channel operations, enabling non-blocking communication and timeouts.

The goroutine doesn't end until the time passes. time.After creates a goroutine with a timer that remains in memory until expiration, potentially causing memory leaks in loops.

Implement String() string method. The fmt package calls String() when formatting values with %v or %s, allowing custom string representations.

In Const (Write = iota; Read; Execute;), Read equals 1. iota starts at 0 for Write, increments to 1 for Read, and 2 for Execute in constant declarations.

Sync.WaitGroup waits for goroutines to complete. Use Add() before starting goroutines, Done() when they finish, and Wait() to block until all are done.

JSON Unmarshal is case insensitive by default. It matches JSON fields to struct fields regardless of case, making JSON parsing more flexible and forgiving.