Go: errgroup - WaitGroup with error handling

Why use it?

Start goroutines with g.Go(), passing a function that returns an error.
Wait for all to finish (and get the first error, if any) with g.Wait().
No need to call Add() or manage error channels yourself.

Example:

package main

import (
    "fmt"
    "golang.org/x/sync/errgroup"
)

func main() {
    var g errgroup.Group

    for i := 1; i <= 3; i++ {
        id := i
        g.Go(func() error {
            fmt.Printf("Goroutine %d is running\n", id)
            return nil // return error if something fails
        })
    }

    if err := g.Wait(); err != nil {
        fmt.Println("Error:", err)
    } else {
        fmt.Println("All goroutines finished")
    }
}

Summary

No boilerplate for adding/waiting.
Easy error handling from concurrent tasks.

Reference:

errgroup docs