how to remove one letter of a string code example

Example 1: javascript remove first character from string

var newStr = str.substring(1);

Example 2: 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'));