Return value

[ehsansouri23]

One of my use cases was to retry a block of code that returns a value. so I opened this pull request also to return value if retrying was successful. otherwise return nil and error

[dillonstreator]

This would be a breaking change and it's already possible to capture whatever arbitrary value(s) your retryable function may produce with native closure semantics.

var err error
var result interface{}

err = retry.Do(func() error {
  result, err = someFn()
  return err
})
if err != nil {}

// use result

This pattern is also shown in the readme https://github.com/avast/retry-go#synopsis

[JaSei]

I agree with @dillonstreator.
Please take a look at #91 if you find it valuable. Comments and concerns are welcome.