Remove consecutive duplicate characters in a string javascript

Question

I have some string like 11122_11255_12_223_12 and the output I wish to have is this: 12_125_12_23_12
I already looked at this and also this a

Answer 1

Easy and recursive way

let x = "11122_11255_12_223_12".split('');
let i = 0;
let j = 1;

function calc(x) {
  if (x[i] == x[j]) {
    x.splice(j, 1);
    calc(x);
  }
  
  if (j == x.length) {
    return x.join('');
  }
  
  i += 1;
  j += 1;
  calc(x);
}
console.log(calc(x));