How to sort emails array with JavaScript based on given importance object as number

Javascript Sort an array based on importance given as an object

function emailSort(a, b) {
    const importance = {"gmail.com": 1, "yahoo.com": 2, "rocketmail.com": 3, "ymail.com": 4};

    const importanceOfA = importance[a.split('@')[1]];
    const importanceOfB = importance[b.split('@')[1]];

    if (importanceOfA && !importanceOfB) return -1;
    if (importanceOfB && !importanceOfA) return 1;
    if (importanceOfA && importanceOfB) return importanceOfA - importanceOfB;

    return 0;
}

arra = [
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
]
newArray = arra.sort(emailSort);
console.log(newArray)
//will return
// [ '[email protected]', 
//   '[email protected]', 
//   '[email protected]', 
//   '[email protected]', 
//   '[email protected]', 
//   '[email protected]', 
//   '[email protected]', 
//   '[email protected]', 
//   '[email protected]', 
//   '[email protected]', 
//   '[email protected]', 
//   '[email protected]' ]