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Update 06. 避免创建不必要的对象.md

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06. 避免创建不必要的对象.md
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# 6. 避免创建不必要的对象
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　　在每次需要时重用一个对象而不是创建一个新的相同功能对象通常是恰当的。重用可以更快更流行。如果对象是不可变的 (条目 17)，它总是可以被重用。