Go で chomp （末尾の改行文字を取り除く）

strings.TrimSuffix() を使う。

strings.TrimSuffix(s, "\n")

s := " hello, world!\n"
fmt.Printf("%#v\n", strings.TrimSuffix(s, "\n"))
//=> " hello, world!"

https://golang.org/pkg/strings/#TrimSuffix

TrimRight() も \n だけを取り除くのであれば同じだが、 TrimSuffix を使う方が適切らしい。

s := " hello, world!\n"
fmt.Printf("%#v\n", strings.TrimRight(s, "\n"))
//=> " hello, world!"

https://golang.org/pkg/strings/#TrimRight

TrimRight returns a slice of the string s, with all trailing Unicode code points contained in cutset removed.

To remove a suffix, use TrimSuffix instead.

TrimSpace() は文字列の両端の空白文字を取り除く。

s := " hello, world!\n"
fmt.Printf("%#v\n", strings.TrimSpace(s))
//=> "hello, world!"

https://golang.org/pkg/strings/#TrimSpace

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Ruby との対比表を作るならこんな感じ

Ruby	String#chomp	String#rstrip	String#strip
Go	strings.TrimSuffix(s, "\n")	strings.TrimRight(s, " \t\r\n\f\v\0")	strings.TrimSpace(s)

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実験結果

https://play.golang.org/p/CQfFcqK9hwt