Check two string (May be they are not in order but contain similar string char)

checkStr.js

// if we pass rats and star will be match
// if we pass star and wars then it will be not match

function checkStr(A, B) {
  if(A && B) {
    var x = A.split('').sort(),
        y = B.split('').sort(),
        count = 0;
   
    if(x.length != y.length) {
      return;
    } 

    for(i=0; i< x.length; i++) {
      if (x[i] === y[i]) {
        count++;
      }
    }

    if(x.length === count) {
      return 'Match';
    }
  }
}

var returndata = checkStr('star', 'rats');
var returndataAnotherTest = checkStr('abcdw', 'acbw');
var returndataTestNull = checkStr(null, 'acbw');
var returndataAnotherTestNull = checkStr('abdw', null);
var returndataBothNull = checkStr(null, null);

console.log(returndata);
console.log(returndataAnotherTest);
console.log(returndataTestNull);
console.log(returndataAnotherTestNull);
console.log(returndataBothNull);