stream Function.identity() 相当于

stream Function.identity() 相当于返回一个函数，该函数接受一个输入值，并将其直接返回作为结果。这意味着它不会对输入值进行任何处理或转换，只是简单地将输入值原样返回。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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