Golang的默认值模式

Question

I have this:

port := os.Getenv("huru_api_port") ||  ":8000"

that doesn't compile, Golang doesn't recognize that as syntax for defaulting to ":8000" if huru_api_port is empty/undefined.

Is there a good way to do this? On a side note, why is it ":8000" instead of "8000", for example:

log.Fatal(http.ListenAndServe(":8000", router))

Answer 1

There's no easy shorthand way to do that in Go, but for your case, you can use LookupEnv instead, which returns the value (if set) and a boolean indicating whether the key was found in the environment:

https://golang.org/pkg/os/#LookupEnv