libgo/go/strings/compare.go

   1 // Copyright 2015 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package strings
   6
   7 // Compare returns an integer comparing two strings lexicographically.
   8 // The result will be 0 if a==b, -1 if a < b, and +1 if a > b.
   9 //
  10 // Compare is included only for symmetry with package bytes.
  11 // It is usually clearer and always faster to use the built-in
  12 // string comparison operators ==, <, >, and so on.
  13 func Compare(a, b string) int {
  14         // NOTE(rsc): This function does NOT call the runtime cmpstring function,
  15         // because we do not want to provide any performance justification for
  16         // using strings.Compare. Basically no one should use strings.Compare.
  17         // As the comment above says, it is here only for symmetry with package bytes.
  18         // If performance is important, the compiler should be changed to recognize
  19         // the pattern so that all code doing three-way comparisons, not just code
  20         // using strings.Compare, can benefit.
  21         if a == b {
  22                 return 0
  23         }
  24         if a < b {
  25                 return -1
  26         }
  27         return +1
  28 }