Concurrency patterns on Golang: ErrGroup

Problems this pattern can solve: You've launched 5 goroutines. You need to wait for all of them to complete, but if at least one fails with an error — stop the rest and return the error. Implementing this with sync.WaitGroup + context + error channels leads to boilerplate code that's easy to break. In the classic approach, if one goroutine fails with an error, the rest continue working uselessly or, worse, block forever writing to a channel that no one is reading from. This is a resource leak. The problem of complex error collection from multiple goroutines. You need to collect all errors or at least the first significant one. Manual implementation requires creating mutexes to protect a shared error variable or separate channels. Essence : ErrGroup is a goroutine group manager that provides two main mechanisms: Synchronization : Waiting for all launched goroutines to complete (like sync.WaitGroup). Error propagation and cancellation : When an error occurs in any of the goroutines, the