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<header>Updated: 2017-07-15 17:11:29 CST +08</header>
<main>
<h1 id="golang-refactor-by-label">Golang Refactor by Label</h1>
<h2 id="introduction">Introduction</h2>
<blockquote>
<p>Labels are declared by labeled statements and are used in the <strong>“break”</strong>, <strong>“continue”</strong>, and <strong>“goto”</strong> statements. - “Label scopes”, The Go Programming Language Specification</p>
</blockquote>
<h2 id="example">Example</h2>
<ul>
<li><p>Traditional, use varible as a flag</p>
<pre><code class="language-go">func main() {
var sum int
stop := false // set a flag
for i := 0; i < 10; i++ {
for j := 0; j < 10; j++ {
sum = i * j
if sum > 80 {
stop = true // set flag to true for break outer loop
break
}
}
if stop {
break
}
}
fmt.Println(sum)
}
</code></pre></li>
<li><p>Refactor by Label</p>
<pre><code class="language-go">func main() {
var sum int
FirstLoop: // define a label
for i := 0; i < 10; i++ {
for j := 0; j < 10; j++ {
sum = i * j
if sum > 80 {
break FirstLoop // break label scope
}
}
}
fmt.Println(sum)
}
</code></pre></li>
</ul>
<h2 id="reference">Reference</h2>
<ul>
<li><a href="https://golang.org/ref/spec#Label_scopes">Label Scopes@The Go Programming Language Specification</a></li>
<li><a href="https://golang.org/ref/spec#Break_statements">Break statements@The Go Programming Language Specification</a></li>
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