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<div class="sidetoc"><nav class="pagetoc"></nav></div>
<main>
<ul dir="auto"><li><em>凹语言(Go实现, 面向WASM设计): <a href="https://github.com/wa-lang/wa">https://github.com/wa-lang/wa</a></em></li><li><em>WaBook(Go语言实现的MD电子书构建工具): <a href="https://github.com/wa-lang/wabook">https://github.com/wa-lang/wabook</a></em></li></ul><hr>
<ul dir="auto"><li><em>凹语言(Go实现, 面向WASM设计): <a href="https://github.com/wa-lang/wa">https://github.com/wa-lang/wa</a></em></li><li><em>《Go语言高级编程》: <a href="https://github.com/chai2010/advanced-go-programming-book">https://github.com/chai2010/advanced-go-programming-book</a></em></li></ul><hr>
<h2>9.5. sync.Once惰性初始化</h2>
<p>如果初始化成本比较大的话，那么将初始化延迟到需要的时候再去做就是一个比较好的选择。如果在程序启动的时候就去做这类初始化的话，会增加程序的启动时间，并且因为执行的时候可能也并不需要这些变量，所以实际上有一些浪费。让我们来看在本章早一些时候的icons变量：</p>