inkch/gobyexample
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Clean up the defer example a bit

Browse Source
This commit is contained in:
Eli Bendersky
2025-01-29 05:39:08 -08:00
parent 2a6ddb935b
commit 9f92e064a1
3 changed files with 8 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
examples/defer/defer.go
View File

@@ -37,7 +37,6 @@ func createFile(p string) *os.File {
func writeFile(f *os.File) {
fmt.Println("writing")
fmt.Fprintln(f, "data")
}
func closeFile(f *os.File) {
@@ -46,7 +45,6 @@ func closeFile(f *os.File) {
// It's important to check for errors when closing a
// file, even in a deferred function.
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(1)
panic(err)
}
}

4
examples/defer/defer.hash
View File

@@ -1,2 +1,2 @@
f0eb978a0cdbacc5e4d709bccce6cea6b71be39f
5SDVfc_jxbg
249d0bc915e075a664be8b4e9115aa9568c8999e
nhAzhDn_jga

20
public/defer generated
View File

@@ -47,7 +47,7 @@ purposes of cleanup. <code>defer</code> is often used where e.g.
</td>
<td class="code leading">
<a href="https://go.dev/play/p/5SDVfc_jxbg"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<a href="https://go.dev/play/p/nhAzhDn_jga"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<pre class="chroma"><code><span class="line"><span class="cl"><span class="kn">package</span> <span class="nx">main</span></span></span></code></pre>
</td>
</tr>
@@ -121,17 +121,8 @@ of the enclosing function (<code>main</code>), after
<pre class="chroma"><code><span class="line"><span class="cl"><span class="kd">func</span> <span class="nf">writeFile</span><span class="p">(</span><span class="nx">f</span> <span class="o">*</span><span class="nx">os</span><span class="p">.</span><span class="nx">File</span><span class="p">)</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">&#34;writing&#34;</span><span class="p">)</span>
</span></span><span class="line"><span class="cl"> <span class="nx">fmt</span><span class="p">.</span><span class="nf">Fprintln</span><span class="p">(</span><span class="nx">f</span><span class="p">,</span> <span class="s">&#34;data&#34;</span><span class="p">)</span></span></span></code></pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><code><span class="line"><span class="cl"><span class="p">}</span></span></span></code></pre>
</span></span><span class="line"><span class="cl"> <span class="nx">fmt</span><span class="p">.</span><span class="nf">Fprintln</span><span class="p">(</span><span class="nx">f</span><span class="p">,</span> <span class="s">&#34;data&#34;</span><span class="p">)</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span></span></span></code></pre>
</td>
</tr>
@@ -156,8 +147,7 @@ file, even in a deferred function.</p>
<td class="code">
<pre class="chroma"><code><span class="line"><span class="cl"> <span class="k">if</span> <span class="nx">err</span> <span class="o">!=</span> <span class="kc">nil</span> <span class="p">{</span>
</span></span><span class="line"><span class="cl"> <span class="nx">fmt</span><span class="p">.</span><span class="nf">Fprintf</span><span class="p">(</span><span class="nx">os</span><span class="p">.</span><span class="nx">Stderr</span><span class="p">,</span> <span class="s">&#34;error: %v\n&#34;</span><span class="p">,</span> <span class="nx">err</span><span class="p">)</span>
</span></span><span class="line"><span class="cl"> <span class="nx">os</span><span class="p">.</span><span class="nf">Exit</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
</span></span><span class="line"><span class="cl"> <span class="nb">panic</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span>
</span></span><span class="line"><span class="cl"> <span class="p">}</span>
</span></span><span class="line"><span class="cl"><span class="p">}</span></span></span></code></pre>
</td>
@@ -197,7 +187,7 @@ after being written.</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' f :\u003D createFile(\"/tmp/defer.txt\")\u000A defer closeFile(f)\u000A writeFile(f)\u000A}\u000A');codeLines.push('func createFile(p string) *os.File {\u000A fmt.Println(\"creating\")\u000A f, err :\u003D os.Create(p)\u000A if err !\u003D nil {\u000A panic(err)\u000A }\u000A return f\u000A}\u000A');codeLines.push('func writeFile(f *os.File) {\u000A fmt.Println(\"writing\")\u000A fmt.Fprintln(f, \"data\")\u000A');codeLines.push('}\u000A');codeLines.push('func closeFile(f *os.File) {\u000A fmt.Println(\"closing\")\u000A err :\u003D f.Close()\u000A');codeLines.push(' if err !\u003D nil {\u000A fmt.Fprintf(os.Stderr, \"error: %v\\n\", err)\u000A os.Exit(1)\u000A }\u000A}\u000A');codeLines.push('');
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' f :\u003D createFile(\"/tmp/defer.txt\")\u000A defer closeFile(f)\u000A writeFile(f)\u000A}\u000A');codeLines.push('func createFile(p string) *os.File {\u000A fmt.Println(\"creating\")\u000A f, err :\u003D os.Create(p)\u000A if err !\u003D nil {\u000A panic(err)\u000A }\u000A return f\u000A}\u000A');codeLines.push('func writeFile(f *os.File) {\u000A fmt.Println(\"writing\")\u000A fmt.Fprintln(f, \"data\")\u000A}\u000A');codeLines.push('func closeFile(f *os.File) {\u000A fmt.Println(\"closing\")\u000A err :\u003D f.Close()\u000A');codeLines.push(' if err !\u003D nil {\u000A panic(err)\u000A }\u000A}\u000A');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>