Run once then repeat a script

I've written the following which successfully repeats the script in 5 second intervals. However, I'd like it to start without a 5 second delay. Is ti possible to run the script once without the delay, then start it?

<body onload="Run()">


 
<p id = "Text" style =
    "text-align:right; font-size: 100%; font-weight: bold; font-style: italic; color: black; font-family:poppins;">
</p>
 
<script>
 
    var down = document.getElementById('Text');         
    var arr = [
      "\"The end of the liver and the beginning of reading.\"",
      "\"The most straight geniuses intent lemur sand,\"",
      "\"Passim abandonment to fashion,\"",
         
              ];
     
     
 setInterval(function Run() {
        down.innerHTML =
            arr[Math.floor(Math.random() * arr.length)];
  }, 5000) </script>

Solution

Sorry, if I interrupted your little cat and mouse game here ;-)

The following snippet contains a few corrections that will make the script work:

I defined the function Run() independently of the setInterval() call
and then I refer to it as the callback function for setInterval().

function Run() {
 down.innerHTML=arr[Math.floor(Math.random() * arr.length)]; }  
const down= document.getElementById('Text');         
const arr = ["hello","goodbye","and whatever","I wanted to say"];
        
setInterval(Run,5000);

<body onload="Run()">     
<p id = "Text" style =
    "text-align:right; font-size: 100%; font-weight: bold; font-style: italic; color: black; font-family:poppins;">
</p>

In SO snippets the <script> portion will always be called after the HTML section has been loaded. This is of course something you must make sure in your own document structure. The easiest way to achieve that would be to place the <script> section after your <body>.