p.xiii, ¶1: delete "Object Oberon". (Thanks to Luca Boasso, 2016-02-15.)
p.9, ¶2: For "can compared", read "can be compared". (Thanks to Antonio Macías Ojeda, 2015-10-22. Corrected in the second printing.)
p.13: As printed, the gopl.io/ch1/lissajous program
is deterministic, not random. We've added the statement below to
the downloadable program so that it prints a pseudo-random image
each time it is run. (Thanks to Randall McPherson, 2015-10-19.)
rand.Seed(time.Now().UTC().UnixNano())
p.15, ¶2: For "inner loop", read "outer loop". (Thanks to Ralph Corderoy, 2015-11-28. Corrected in the third printing.)
p.19, ¶2: For "Go's libraries makes", read "Go's library makes". (Thanks to Victor Farazdagi, 2015-11-30. Corrected in the third printing.)
p.40, ¶4: For "value of the underlying type", read "value of an unnamed type with the same underlying type". (Thanks to Carlos Romero Brox, 2015-12-19.)
p.40, ¶1: The paragraph should end with a period, not a comma. (Thanks to Victor Farazdagi, 2015-11-30. Corrected in the third printing.)
p.43, ¶3: Import declarations are explained in §10.4, not §10.3. (Thanks to Peter Jurgensen, 2015-11-21. Corrected in the third printing.)
p.48: f.ReadByte() serves as an
example of a reference to f, but *os.File has no such
method. For "ReadByte", read "Stat", four times.
(Thanks to Peter Olsen, 2016-01-06.)
p.52, ¶2: For "an synonym", read "a synonym", twice. (Corrected in the second printing.)
p.52, ¶9: For "The integer arithmetic operators", read "The arithmetic operators". (Thanks to Yoshiki Shibata, 2015-12-20.)
p.57, ¶4: To "any comparison with NaN always yields false",
add "(except !=, which is always the negation of
==)".
(Thanks to Luca Boasso, 2016-02-15.)
p.68: The table of UTF-8 encodings is missing a bit from each first byte. The corrected table is shown below. (Thanks to Akshay Kumar, 2015-11-02. Corrected in the second printing.)
0xxxxxxx runes 0−127 (ASCII) 110xxxxx 10xxxxxx 128−2047 (values <128 unused) 1110xxxx 10xxxxxx 10xxxxxx 2048−65535 (values <2048 unused) 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx 65536−0x10ffff (other values unused)
p.73, ¶1: For "a exercise", read "an exercise". (Thanks to vrajmohan, 2015-12-28.)
p.74: The comment in gopl.io/ch3/printints should say
fmt.Sprint, not fmt.Sprintf.
(Corrected in the second printing.)
p.75, ¶4: For "%u", read "%o".
(Thanks to William Hannish, 2015-12-21.)
p.76: The comment // "time.Duration 5m0s should have
a closing double-quotation mark.
(Corrected in the second printing.)
p.79, ¶4: "When an untyped constant is assigned to a variable, as in the first statement below, or appears on the right-hand side of a variable declaration with an explicit type, as in the other three statements, ..." has it backwards: the first statement is a declaration; the other three are assignments. (Thanks to Yoshiki Shibata, 2015-11-09. Corrected in the third printing.)
p.84, ¶2: For "used as function parameters", read "used as function parameters or results". (Thanks to Yang Yang 杨玚, 2016-04-18.)
p.112: Exercise 4.11 calls for a "CRUD" (create, read, update, delete) tool for GitHub Issues. Since GitHub does not currently allow Issues to be deleted, for "delete", read "close". (Thanks to Yoshiki Shibata, 2016-01-18.)
p.115: The anchor element in
gopl.io/ch4/issueshtml's template is missing a closing
</a> tag. (Thanks to Taj Khattra, 2016-01-19.)
p.132, code display following ¶3: The final comment
should read:
// compile error: can't assign func(int, int) int to func(int) int
(Thanks to Toni Suter, 2015-11-21. Corrected in the third printing.)
p.139, ¶4: For "in Chapter 3", read "in Chapter 4". (Thanks to Yoshiki Shibata, 2016-07-03.)
p.160, ¶4: For Get("item")),
read Get("item").
(Thanks to Yoshiki Shibata, 2016-02-01.)
p.166, ¶2: For "way", read "a way". (Corrected in the third printing.)
p.177, ¶6: For "as we saw", read "as we will see". (Thanks to David Drysdale, 2016-07-05.)
p.200, TestEval function: The format string in the final call to
t.Errorf should format test.env with %v,
not %s.
(Thanks to Mitsuteru Sawa, 2015-12-07. Corrected in the third printing.)
p.222, Exercise 8.1: The port numbers for London
and Tokyo should be swapped in the final command to
match the earlier commands.
(Thanks to Kiyoshi Kamishima, 2016-01-08.)
p.235, ¶3: makeThumbnails refers to the second draft
of the function, makeThumbnails2.
(Thanks to 有賀功 Isao Aruga, 2016-07-13.)
p.272, ¶3: for "the request body", read "the response body". (Thanks to 曹春晖, 2016-01-19.)
p.288, code display following ¶4: In the import declaration, for
"database/mysql", read "database/sql".
(Thanks to Jose Colon Rodriguez, 2016-01-09.)
p.320, code display following ¶1: The suggested test case
does not exercise the unary plus operator, nor is
the eval package qualifier appropriate:
{"-x * -x", eval.Env{"x": 2}, "4"}
It should read:
{"+x * -x", Env{"x": 2}, "4"}
(Thanks to Shinji Dosaka, 2016-07-15.)
p.341, Exercise 12.7: For "encoder" and
"json.Encoder", read "decoder" and
"json.Decoder", respectively.
(Thanks to Yoshiki Shibata, 2016-08-27.)
p.347, Exercise 12.8: For "like json.Marshal",
read "like json.Unmarshal".
(Thanks to chai2010, 2016-01-01.)
p.362: The gopl.io/ch13/bzip program
does not comply with the
proposed rules for passing pointers between Go and C code
because the C function bz2compress temporarily stores a Go
pointer (in) into the Go heap
(the bz_stream variable).
The bz_stream variable should be allocated, and
explicitly freed after the call to
BZ2_bzCompressEnd, by C functions.
(Thanks to Joe Tsai, 2015-11-18. Corrected in the third printing.)
p.366, Exercise 13.3: For bzip2.writer, read bzip.writer.
(Thanks to Yoshiki Shibata, 2015-12-20.)