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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -185,25 +185,25 @@ <h2 id="the-newtype-pattern-improves-code-quality"><a class="header" href="#the- | |
| <pre><code class="language-go">package main | ||
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| import ( | ||
| "fmt" | ||
| "strings" | ||
| "fmt" | ||
| "strings" | ||
| ) | ||
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| type Email string | ||
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| func newEmail(email string) (Email, error) { | ||
| if !strings.Contains(email, "@") { | ||
| return Email(""), fmt.Errorf("Expected @ in the email") | ||
| if !strings.Contains(email, "@") { | ||
| return Email(""), fmt.Errorf("Expected @ in the email") | ||
| } | ||
| return Email(email), nil | ||
| } | ||
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| func (email Email) Domain() string { | ||
| return strings.Split(string(email), "@")[1] | ||
| return strings.Split(string(email), "@")[1] | ||
| } | ||
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| func main() { | ||
| ping, err := newEmail("[email protected]") | ||
| ping, err := newEmail("[email protected]") | ||
| if err != nil { panic(err) } | ||
| fmt.Println(ping.Domain()) | ||
| } | ||
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@@ -226,7 +226,7 @@ <h2 id="when-to-use-value-or-pointer-receiver"><a class="header" href="#when-to- | |
| <li>What is the GC behavior of the rest of the program? GC pressure may favor value receivers.</li> | ||
| </ul> | ||
| <h2 id="parallel-for-loop"><a class="header" href="#parallel-for-loop">Parallel For-Loop</a></h2> | ||
| <p>There are two types of for loop on range: "with index" and "without index". Let's see an example for range with index.</p> | ||
| <p>There are two types of for loop on range: "with index" and "without index". Let's see an example for range with index.</p> | ||
| <pre><code class="language-go">func TestRangeWithIndex(t *testing.T) { | ||
| rows := []struct{ index int }{{index: 0}, {index: 1}, {index: 2}} | ||
| for _, row := range rows { | ||
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@@ -248,7 +248,7 @@ <h2 id="parallel-for-loop"><a class="header" href="#parallel-for-loop">Parallel | |
| <h3 id="the-same-instance-of-the-variable"><a class="header" href="#the-same-instance-of-the-variable">The same instance of the variable</a></h3> | ||
| <p>Since the the loop iterator variable is the same instance of the variable, it may result in tricky error with parallel for-loop.</p> | ||
| <pre><code class="language-go">done := make(chan bool) | ||
| values := []string{"a", "b", "c"} | ||
| values := []string{"a", "b", "c"} | ||
| for _, v := range values { | ||
| go func() { | ||
| fmt.Println(v) | ||
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@@ -259,7 +259,7 @@ <h3 id="the-same-instance-of-the-variable"><a class="header" href="#the-same-ins | |
| <-done | ||
| } | ||
| </code></pre> | ||
| <p>You might expect to see <code>a</code>, <code>b</code>, <code>c</code> as the output, but you'll probably see instead is <code>c</code>, <code>c</code>, <code>c</code>. </p> | ||
| <p>You might expect to see <code>a</code>, <code>b</code>, <code>c</code> as the output, but you'll probably see instead is <code>c</code>, <code>c</code>, <code>c</code>.</p> | ||
| <p>This is because each iteration of the loop uses the same instance of the variable <code>v</code>, so each closure shares that single variable.</p> | ||
| <p>This is the same reason which result wrong test when use <code>t.Parallel()</code> with range, which is covered in <a href="../get-started/write-and-run-unit-tests.html#parallel">Parallel section of Write and run unit tests</a></p> | ||
| <h3 id="a-clone-of-iteration-target-value"><a class="header" href="#a-clone-of-iteration-target-value">A clone of iteration target value</a></h3> | ||
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