JAVASCRIPT

javascript remove duplicate letters in a string

function removeDuplicateCharacters(string) {
  return string
    .split('')
    .filter(function(item, pos, self) {
      return self.indexOf(item) == pos;
    })
    .join('');
}
console.log(removeDuplicateCharacters('baraban'));

remove the duplicate character in string js

function removeDuplicate(str, letSingleChar = false)  {
    let string = str;
    for (element of string) {
        const re = new RegExp(element, 'g');
        if (string.match(re)?.length > 1) {
          if (letSingleChar == true) {
            string = [...new Set(string.split(''))].join('');
          } else 
            string = string.replace(re, '');
        }
    }
    return string;
} 

console.log(removeDuplicate("Hello World", true)) // Helo Wrd
console.log(removeDuplicate("Hello World", false )) // He Wrd

remove repeated characters from a string in javascript

const unrepeated = (str) => [...new Set(str)].join('');

unrepeated("hello"); //➞ "helo"
unrepeated("aaaaabbbbbb"); //➞ "ab"
unrepeated("11112222223333!!!??"); //➞ "123!?"

remove duplicate values from string in javascript

const names = ['John', 'Paul', 'George', 'Ringo', 'John'];

let unique = [...new Set(names)];
console.log(unique);