String Manipulator - Group 2

function solve(param){
  let str = param.shift();

  for(let el of param){
      let [command,char,replacement] = el.split(' ');

      switch(command){
        case 'Change':
            while(str.includes(char)){
                str = str.replace(char,replacement);
            }
            console.log(str)
        ;break;
        case 'Includes':
            console.log(str.includes(char)? 'True':'False')
        ;break;
        case 'End':
            if(str.includes(char)){
             let lastWords = str.slice(str.length - char.length);
             console.log(lastWords ===  char? 'True':'False');
            }
        ;break;
        case 'Uppercase':
          str = str.toUpperCase();
          console.log(str);
        ;break;
        case 'FindIndex':
          if(str.includes(char)){
            let ind = str.indexOf(char);
            console.log(ind)
          }
        ;break;
        case 'Cut':
          let startInd = +char;
          let length = +replacement;

          if(startInd >= 0 && startInd <= str.length && length <= str.length){
             let result = str.substr(startInd,length);
             console.log(result)
          }
        ;break;
      }
  }
}