JSFiddle - React, Tailwind, and code Playground
JavaScript
function removeDuplicates(str) {
return str.split('').filter((item,i,array) => item !== array[i-1]).join('');
}
console.log(removeDuplicates('Hellllllllllo') === 'Helo');
console.log(removeDuplicates('2..toFixed()') === '2.toFixed()');
console.log(removeDuplicates('Frontend Raccoon') === 'Frontend Racon');