86 lines
1.9 KiB
Go
86 lines
1.9 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package bytes_test
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import (
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"bytes"
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"encoding/base64"
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"fmt"
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"io"
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"os"
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"sort"
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)
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func ExampleBuffer() {
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var b bytes.Buffer // A Buffer needs no initialization.
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b.Write([]byte("Hello "))
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fmt.Fprintf(&b, "world!")
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b.WriteTo(os.Stdout)
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// Output: Hello world!
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}
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func ExampleBuffer_reader() {
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// A Buffer can turn a string or a []byte into an io.Reader.
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buf := bytes.NewBufferString("R29waGVycyBydWxlIQ==")
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dec := base64.NewDecoder(base64.StdEncoding, buf)
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io.Copy(os.Stdout, dec)
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// Output: Gophers rule!
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}
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func ExampleCompare() {
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// Interpret Compare's result by comparing it to zero.
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var a, b []byte
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if bytes.Compare(a, b) < 0 {
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// a less b
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}
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if bytes.Compare(a, b) <= 0 {
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// a less or equal b
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}
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if bytes.Compare(a, b) > 0 {
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// a greater b
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}
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if bytes.Compare(a, b) >= 0 {
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// a greater or equal b
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}
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// Prefer Equal to Compare for equality comparisons.
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if bytes.Equal(a, b) {
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// a equal b
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}
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if !bytes.Equal(a, b) {
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// a not equal b
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}
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}
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func ExampleCompare_search() {
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// Binary search to find a matching byte slice.
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var needle []byte
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var haystack [][]byte // Assume sorted
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i := sort.Search(len(haystack), func(i int) bool {
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// Return haystack[i] >= needle.
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return bytes.Compare(haystack[i], needle) >= 0
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})
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if i < len(haystack) && bytes.Equal(haystack[i], needle) {
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// Found it!
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}
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}
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func ExampleTrimSuffix() {
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var b = []byte("Hello, goodbye, etc!")
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b = bytes.TrimSuffix(b, []byte("goodbye, etc!"))
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b = bytes.TrimSuffix(b, []byte("gopher"))
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b = append(b, bytes.TrimSuffix([]byte("world!"), []byte("x!"))...)
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os.Stdout.Write(b)
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// Output: Hello, world!
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}
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func ExampleTrimPrefix() {
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var b = []byte("Goodbye,, world!")
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b = bytes.TrimPrefix(b, []byte("Goodbye,"))
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b = bytes.TrimPrefix(b, []byte("See ya,"))
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fmt.Printf("Hello%s", b)
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// Output: Hello, world!
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}
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