Jquery поиск input [type=“text|email”]

var a = $('input[type="text"]:first, input[type="email"]:first, input[type="tel"]:first').val(); 
console.log(a);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<div class="el"> 
  <input type="checkbox" value="3"> 
</div> 
<div class="el"> 
  <input type="text" value="4"> 
</div> 
<div class="el"> 
  <input type="email" value="1"> 
</div> 
<div class="el"> 
  <input type="tel" value="2"> 
</div>

var a = $(".el input").filter("[type='text'], [type='email'], [type='tel']").val(); 
console.log(a);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
<div class="el"> 
  <input type="tel" value="4"/> 
</div><div class="el"> 
  <input type="email" value="3"/> 
</div> 
<div class="el"> 
  <input type="radio" value="1"/> 
</div> 
<div class="el"> 
  <input type="text" value="2"/> 
</div>