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doc: sort map output in Effective Go 

And explain that it does this. A minor change probably worth mentioning,
although (#28782) I'd still like to freeze this document against any substantial
changes.

Fix #30568.

Change-Id: I74c56744871cfaf00dc52a9b480ca61d3ed19a6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/165597
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Rob Pike 2019-03-06 11:56:06 +11:00
parent e90f572cd6
commit c7408a8775
1 changed files with 4 additions and 4 deletions
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8
doc/effective_go.html
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@ -1680,13 +1680,13 @@ maps. Here is a print statement for the time zone map defined in the previous s
fmt.Printf("%v\n", timeZone) // or just fmt.Println(timeZone)
</pre>
<p>
which gives output
which gives output:
</p>
<pre>
map[CST:-21600 PST:-28800 EST:-18000 UTC:0 MST:-25200]
map[CST:-21600 EST:-18000 MST:-25200 PST:-28800 UTC:0]
</pre>
<p>
For maps the keys may be output in any order, of course.
For maps, <code>Printf</code> and friends sort the output lexicographically by key.
When printing a struct, the modified format <code>%+v</code> annotates the
fields of the structure with their names, and for any value the alternate
format <code>%#v</code> prints the value in full Go syntax.
@ -1710,7 +1710,7 @@ prints
&amp;{7 -2.35 abc def}
&amp;{a:7 b:-2.35 c:abc def}
&amp;main.T{a:7, b:-2.35, c:"abc\tdef"}
map[string]int{"CST":-21600, "PST":-28800, "EST":-18000, "UTC":0, "MST":-25200}
map[string]int{"CST":-21600, "EST":-18000, "MST":-25200, "PST":-28800, "UTC":0}
</pre>
<p>
(Note the ampersands.)