Что значит строчка кода?

      var lastCall = false; var lastCallTimer;		 
 
    	$('.target').keyup(function(){ 
		  	var Value = $('input').val();	 
		  	let logger = (args) => callSearch(args); 
		    let debouncedLogger = debounce(logger, 2000); 
		    debouncedLogger(Value); 
 
		}); 
 
    function debounce(f, t) { 
        return function(args) { 
            let previousCall = lastCall; 
            lastCall = Date.now(); 
            if (previousCall && ((lastCall - previousCall) <= t)) { 
                clearTimeout(lastCallTimer); 
            } 
            lastCallTimer = setTimeout(() => f(args), t); 
        } 
    } 
 
    function callSearch(args) 
    { 
    	console.log(args); 
    }

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> 
 
<input type="" name="" class='target'>