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// Copyright 2009 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 strconv
// ParseBool returns the boolean value represented by the string.
// It accepts 1, t, T, TRUE, true, True, 0, f, F, FALSE, false, False.
// Any other value returns an error.
func ParseBool(str string) (bool, error) {
switch str {
case "1", "t", "T", "true", "TRUE", "True":
return true, nil
case "0", "f", "F", "false", "FALSE", "False":
return false, nil
return false, syntaxError("ParseBool", str)
// FormatBool returns "true" or "false" according to the value of b.
func FormatBool(b bool) string {
if b {
return "true"
return "false"
// AppendBool appends "true" or "false", according to the value of b,
// to dst and returns the extended buffer.
func AppendBool(dst []byte, b bool) []byte {
if b {
return append(dst, "true"...)
return append(dst, "false"...)
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