qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-21 18:44:45 -07:00
Code Releases Activity

go_tutorial: removed outdated use of semicolons

Browse Source 
R=r
CC=golang-dev
https://golang.org/cl/1013042
This commit is contained in:
Andrew Gerrand 2010-04-28 10:50:44 +10:00
parent 69a2e1dc52
commit a82349614b
2 changed files with 44 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
doc/go_tutorial.html
View File

@ -184,7 +184,7 @@ string variable we will use to build the output.
The declaration statement has the form
<p>
<pre>
var s string = "";
var s string = ""
</pre>
<p>
This is the <code>var</code> keyword, followed by the name of the variable, followed by
@ -195,13 +195,13 @@ string constant is of type string, we don't have to tell the compiler that.
We could write
<p>
<pre>
var s = "";
var s = ""
</pre>
<p>
or we could go even shorter and write the idiom
<p>
<pre>
s := "";
s := ""
</pre>
<p>
The <code>:=</code> operator is used a lot in Go to represent an initializing declaration.
@ -264,8 +264,8 @@ However the following statements are illegal because they would modify
a <code>string</code> value:
<p>
<pre>
s[0] = 'x';
(*p)[1] = 'y';
s[0] = 'x'
(*p)[1] = 'y'
</pre>
<p>
In C++ terms, Go strings are a bit like <code>const strings</code>, while pointers
@ -277,7 +277,7 @@ read on.
Arrays are declared like this:
<p>
<pre>
var arrayOfInt [10]int;
var arrayOfInt [10]int
</pre>
<p>
Arrays, like strings, are values, but they are mutable. This differs
@ -341,7 +341,7 @@ If you are creating a regular array but want the compiler to count the
elements for you, use <code>...</code> as the array size:
<p>
<pre>
s := sum(&amp;[...]int{1,2,3});
s := sum(&amp;[...]int{1,2,3})
</pre>
<p>
In practice, though, unless you're meticulous about storage layout within a
@ -349,7 +349,7 @@ data structure, a slice itself&mdash;using empty brackets and no
<code>&amp;</code>&mdash;is all you need:
<p>
<pre>
s := sum([]int{1,2,3});
s := sum([]int{1,2,3})
</pre>
<p>
There are also maps, which you can initialize like this:
@ -391,13 +391,13 @@ returns a pointer to the allocated storage.
<p>
<pre>
type T struct { a, b int }
var t *T = new(T);
var t *T = new(T)
</pre>
<p>
or the more idiomatic
<p>
<pre>
t := new(T);
t := new(T)
</pre>
<p>
Some types&mdash;maps, slices, and channels (see below)&mdash;have reference semantics.
@ -406,14 +406,14 @@ referencing the same underlying data will see the modification. For these three
types you want to use the built-in function <code>make()</code>:
<p>
<pre>
m := make(map[string]int);
m := make(map[string]int)
</pre>
<p>
This statement initializes a new map ready to store entries.
If you just declare the map, as in
<p>
<pre>
var m map[string]int;
var m map[string]int
</pre>
<p>
it creates a <code>nil</code> reference that cannot hold anything. To use the map,
@ -518,9 +518,9 @@ the ones used to build maps and arrays, to construct a new heap-allocated
object. We could write
<p>
<pre>
n := new(File);
n.fd = fd;
n.name = name;
n := new(File)
n.fd = fd
n.name = name
return n
</pre>
<p>
@ -640,7 +640,7 @@ We can now use our new package:
11 )
<p>
13 func main() {
14 hello := []byte{'h', 'e', 'l', 'l', 'o', ',', ' ', 'w', 'o', 'r', 'l', 'd', '\n'}
14 hello := []byte(&quot;hello, world\n&quot;)
15 file.Stdout.Write(hello)
16 file, err := file.Open(&quot;/does/not/exist&quot;, 0, 0)
17 if file == nil {
@ -903,7 +903,7 @@ to test that the result is sorted.
14 a := sort.IntArray(data)
15 sort.Sort(a)
16 if !sort.IsSorted(a) {
17 panic()
17 panic(&quot;fail&quot;)
18 }
19 }
</pre>
@ -1050,7 +1050,7 @@ Schematically, given a value <code>v</code>, it does this:
</pre>
<p>
<pre>
s, ok := v.(Stringer); // Test whether v implements "String()"
s, ok := v.(Stringer) // Test whether v implements "String()"
if ok {
result = s.String()
} else {
@ -1077,7 +1077,7 @@ interface type defined in the <code>io</code> library:
<p>
<pre>
type Writer interface {
Write(p []byte) (n int, err os.Error);
Write(p []byte) (n int, err os.Error)
}
</pre>
<p>
@ -1162,17 +1162,17 @@ this starts the function running in parallel with the current
computation but in the same address space:
<p>
<pre>
go sum(hugeArray); // calculate sum in the background
go sum(hugeArray) // calculate sum in the background
</pre>
<p>
If you want to know when the calculation is done, pass a channel
on which it can report back:
<p>
<pre>
ch := make(chan int);
go sum(hugeArray, ch);
ch := make(chan int)
go sum(hugeArray, ch)
// ... do something else for a while
result := &lt;-ch; // wait for, and retrieve, result
result := &lt;-ch // wait for, and retrieve, result
</pre>
<p>
Back to our prime sieve. Here's how the sieve pipeline is stitched

42
doc/go_tutorial.txt
View File

@ -143,7 +143,7 @@ string variable we will use to build the output.
The declaration statement has the form
var s string = "";
var s string = ""
This is the "var" keyword, followed by the name of the variable, followed by
its type, followed by an equals sign and an initial value for the variable.
@ -152,11 +152,11 @@ Go tries to be terse, and this declaration could be shortened. Since the
string constant is of type string, we don't have to tell the compiler that.
We could write
var s = "";
var s = ""
or we could go even shorter and write the idiom
s := "";
s := ""
The ":=" operator is used a lot in Go to represent an initializing declaration.
There's one in the "for" clause on the next line:
@ -208,8 +208,8 @@ reassigning it. This snippet from "strings.go" is legal code:
However the following statements are illegal because they would modify
a "string" value:
s[0] = 'x';
(*p)[1] = 'y';
s[0] = 'x'
(*p)[1] = 'y'
In C++ terms, Go strings are a bit like "const strings", while pointers
to strings are analogous to "const string" references.
@ -219,7 +219,7 @@ read on.
Arrays are declared like this:
var arrayOfInt [10]int;
var arrayOfInt [10]int
Arrays, like strings, are values, but they are mutable. This differs
from C, in which "arrayOfInt" would be usable as a pointer to "int".
@ -271,13 +271,13 @@ pointer to "sum()" by (implicitly) promoting it to a slice.
If you are creating a regular array but want the compiler to count the
elements for you, use "..." as the array size:
s := sum(&amp;[...]int{1,2,3});
s := sum(&amp;[...]int{1,2,3})
In practice, though, unless you're meticulous about storage layout within a
data structure, a slice itself&mdash;using empty brackets and no
"&amp;"&mdash;is all you need:
s := sum([]int{1,2,3});
s := sum([]int{1,2,3})
There are also maps, which you can initialize like this:
@ -312,23 +312,23 @@ To allocate a new variable, use "new()", which
returns a pointer to the allocated storage.
type T struct { a, b int }
var t *T = new(T);
var t *T = new(T)
or the more idiomatic
t := new(T);
t := new(T)
Some types&mdash;maps, slices, and channels (see below)&mdash;have reference semantics.
If you're holding a slice or a map and you modify its contents, other variables
referencing the same underlying data will see the modification. For these three
types you want to use the built-in function "make()":
m := make(map[string]int);
m := make(map[string]int)
This statement initializes a new map ready to store entries.
If you just declare the map, as in
var m map[string]int;
var m map[string]int
it creates a "nil" reference that cannot hold anything. To use the map,
you must first initialize the reference using "make()" or by assignment from an
@ -410,9 +410,9 @@ filled in. This code uses Go's notion of a ''composite literal'', analogous to
the ones used to build maps and arrays, to construct a new heap-allocated
object. We could write
n := new(File);
n.fd = fd;
n.name = name;
n := new(File)
n.fd = fd
n.name = name
return n
but for simple structures like "File" it's easier to return the address of a nonce
@ -696,7 +696,7 @@ Schematically, given a value "v", it does this:
String() string
}
s, ok := v.(Stringer); // Test whether v implements "String()"
s, ok := v.(Stringer) // Test whether v implements "String()"
if ok {
result = s.String()
} else {
@ -721,7 +721,7 @@ not a file. Instead, it is a variable of type "io.Writer", which is an
interface type defined in the "io" library:
type Writer interface {
Write(p []byte) (n int, err os.Error);
Write(p []byte) (n int, err os.Error)
}
(This interface is another conventional name, this time for "Write"; there are also
@ -787,15 +787,15 @@ invoke the function, prefixing the call with the keyword "go";
this starts the function running in parallel with the current
computation but in the same address space:
go sum(hugeArray); // calculate sum in the background
go sum(hugeArray) // calculate sum in the background
If you want to know when the calculation is done, pass a channel
on which it can report back:
ch := make(chan int);
go sum(hugeArray, ch);
ch := make(chan int)
go sum(hugeArray, ch)
// ... do something else for a while
result := &lt;-ch; // wait for, and retrieve, result
result := &lt;-ch // wait for, and retrieve, result
Back to our prime sieve. Here's how the sieve pipeline is stitched
together: