I want to truncate a text or line with ellipsis using JavaScript [closed]

by 
function truncate(input) {
   if (input.length > 5) {
      return input.substring(0, 5) + '...';
   }
   return input;
};

or in ES6

const truncate = (input) => input.length > 5 ? `${input.substring(0, 5)}...` : input;

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