relationships.js

function getRelationship(x, y) {
    // Your code goes here!
    
    var xValid = validateNumber(x);
    var yValid = validateNumber(y);
    
    if (xValid && yValid) {
        return getRelationshipSymbol(x, y);
    }
    else if(xValid) {
        // y is invalid
        return 'Can\'t compare relationships because ' + y + ' is not a number';
    }
    else if (yValid) {
        // x is invalid
        return 'Can\'t compare relationships because ' + x + ' is not a number';
    }
    else {
        return 'Can\'t compare relationships because ' + x + ' and ' + y + ' are not numbers';
    }
}

function validateNumber(n) {
    return (typeof n === 'number') && !isNaN(n);
}

function getRelationshipSymbol(x, y) {
    var symbol;
    
    if (x > y) {
        symbol = '>';
    }
    else if(x < y) {
        symbol = '<';
    }
    else {
        symbol = '=';
    }
    
    return symbol;
}

// 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));

UD 804, What's next, Relationships problem

References;

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof
• http://stackoverflow.com/a/2801629/892500