Go中没有startwith，endswith函数？

Just curious to findout: why aren't there standard functions like startswith, endswith, etc as part of the standard libraries in the Go programming language?

The strings package contains HasPrefix and HasSuffix.

import "strings"

startsWith := strings.HasPrefix("prefix", "pre") // true
endsWith := strings.HasSuffix("suffix", "fix") // true

play.golang.org