How can you attempt to access the property a.b on obj without throwing an error if a is undefined? let obj = {};

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How can you attempt to access the property <code>a.b</code> on <code>obj</code> without throwing an error if a is undefined? <pre><code>let obj = {};</code></pre> - 面试真题

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How can you attempt to access the property <code>a.b</code> on <code>obj</code> without throwing an error if a is undefined? <pre><code>let obj = {};</code></pre>

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