String Reduction

stringReduction.js

function getMinDeletions(s) {
  const ordered_string = s.split('').sort().join('');
  let delCount = 0;

  for (let i = 0; i < ordered_string.length; i++) {
      if (ordered_string[i] === ordered_string[i + 1]) {
          delCount++;
      }
  }
  
  return delCount;
}



function getMinDeletionsSet(str){
  let strSet = new Set(str);

  return str.length - strSet.size;
}



function getMinDeletionsArrayFrom(str) {
    const sortedStr= Array.from(str).sort();
    let delCount = 0;

    for (let i = 0; i < sortedStr.length; i++) {
        if (sortedStr[i] === sortedStr[i + 1]) {
            delCount++;
        }
    }

    return delCount;
}