Compare the relationship between two variables

getRelationship.js

function getRelationship(x, y) {
    
    if(x !== x) {
        return "Can't compare relationships because " + x + " and undefined are not numbers";  
    }
    
    if (typeof x != 'number' || typeof y != 'number') {
        if(arguments.length === 2) {
            if(typeof x != 'number' && typeof y != 'number') {
            return "Can't compare relationships because " + x + " and " + y + " are not numbers";
                }
            else {
                return "Can't compare relationships because " + x + " is not a number";
                }   
            }
    else if (typeof x === 'number' && typeof y != 'number') {
            return "Can't compare relationships because undefined is not a number";   
        }
    else {
        return "Can't compare relationships because " + x + " and undefined are not numbers";  
        }
    }
   

    //Can't compare relationships because [this value] and [that value] [is]/[are] not [a] number[s].
    
    if(x > y) {
        return ">";
    }
     else if (x < y) {
       return "<";
    }
    else {
       return "=";
    }
}

// Try logging these functions to test your code!
console.log(getRelationship(1,4));
console.log(getRelationship(1,1));
console.log(getRelationship("that",2));
console.log(getRelationship("this"," something else"));
console.log(getRelationship(3));
console.log(getRelationship("hi"));
console.log(getRelationship(NaN));
console.log(getRelationship(NaN, undefined));