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-rw-r--r--src/hash/maphash/example_test.go37
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diff --git a/src/hash/maphash/example_test.go b/src/hash/maphash/example_test.go
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+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package maphash_test
+
+import (
+ "fmt"
+ "hash/maphash"
+)
+
+func Example() {
+ // The zero Hash value is valid and ready to use; setting an
+ // initial seed is not necessary.
+ var h maphash.Hash
+
+ // Add a string to the hash, and print the current hash value.
+ h.WriteString("hello, ")
+ fmt.Printf("%#x\n", h.Sum64())
+
+ // Append additional data (in the form of a byte array).
+ h.Write([]byte{'w', 'o', 'r', 'l', 'd'})
+ fmt.Printf("%#x\n", h.Sum64())
+
+ // Reset discards all data previously added to the Hash, without
+ // changing its seed.
+ h.Reset()
+
+ // Use SetSeed to create a new Hash h2 which will behave
+ // identically to h.
+ var h2 maphash.Hash
+ h2.SetSeed(h.Seed())
+
+ h.WriteString("same")
+ h2.WriteString("same")
+ fmt.Printf("%#x == %#x\n", h.Sum64(), h2.Sum64())
+}