What a big diff between log15.error and errorf

<p>I look around online, but can&#39;t find the answer.</p> <p>Function-wise, they implement pretty much the same thing. </p> <p>What the scenario of using each of them? I am new to golang. Sorry if the question is naive.</p> <hr/>**评论：**<br/><br/>BubuX: <pre><p>Welcome!</p> <p><a href="https://github.com/inconshreveable/log15" rel="nofollow">https://github.com/inconshreveable/log15</a> is a custom package that offers extra features on top of Go&#39;s default log package.</p></pre>