JSFiddle - React, Tailwind, and code Playground

HTML

<input type='text'>

<p></p>
<span></span>
<em></em>

JavaScript

$('input').keyup(function() {
    var _val = $(this).val();
    $('p').text(_val);

    var _array = ["sun", "mon", "tue", "wed", "thu", "fri", "sat"];
    
    keywords = ["prostate","prostatectomy"]
		var x = keywords.some(keyword=>_val.toLowerCase().includes(keyword))
    $('span').text(x);
    
    if (x) {
    	$('span').text('it worked');
    }
        
    //$('span').text('nothing');

    
    
});