neilisaac / first

Return the first non-nil, non-empty argument

first

Hi. I like to add fallback logic to my programs, but sometimes it's awkward.

I wrote this little library so we can write:

use(first.String(os.Getenv("CONFIG_FIELD_NAME"), "some sort of default"))

as opposed to:

configValue := os.Getenv("CONFIG_FIELD_NAME")
if configValue == "" {
    configValue = "some sort of default"
}
use(configValue)

First also supports:

• frist.String("arbitrary", "numbers", "of", "arguments")
• s := "pointers"; first.String(&s)
• first.String(func() { return "functions returning strings" })
• Interfaces with a String() string method
• first.Error(err1, err2)

Don't panic().