JSFiddle - React, Tailwind, and code Playground

JavaScript

function findSecretMessage(paragraph) {
  arr = paragraph.split(' ');
  ms='';
 
      for (i=0; i<=arr.length; i++){
      arr[i] = arr[i].toLowerCase();
      if(arr[i].match(/\./) != null){
      arr[i] = arr[i].slice(0, -1);
      }
      }
      
  alert('yes');
}
    var paragraph = 'This is a test. this test is fun.';
    findSecretMessage(paragraph);