title: Checking if element is present in list in racket
body: <p>How to check if an element is present in a list, both taken as input from the function call, without using the lambda? I was trying member? but could not get it.</p>
  
  <pre><code>(define (find-string (lst lst str ua)
      (cond ((member? ua lst) #t)
      (else #f))
  </code></pre>