Work will only take as long as slowest process

scatter-gather.go

// Scatter
c := make(chan result, 10)
for i := 0; i < cap(c); i++ {
  go func() {
    val, err := process()
    c <- result{val, err}
  }()
}

// Gather
var total int
for i := 0; i < cap(c); i++ {
  res := <-c
  if res.err != nil {
    total += res.val
  }
}