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A different take from ES6 , using a function and defaults applied.

let email = 'example@example.com';
checkEmail = ({userEmail = email})=>{
    return userEmail;
}

checkOtherEmail = (userEmail = email)=>{
    return userEmail;
}

checkEmail({userEmail = 'test@test.com'});
checkOtherEmail('test@test.com');