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

I really like the regex solution. However, first thing which would come into my mind is a checking char by char with a loop:

const str = "11122_11255_12_223_12";
let last = "";
let result = "";
for(let i = 0; i < str.length; i++){
  let char = str.charAt(i);
  if(char !== last){
    result += char;
    last = char;
  }
}
console.log(result);