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var getAbsoluteUrl = (function() {
  var a;
  return function(url) {
    if(!a) a = document.createElement('a');
    a.href = url;
    return a.href;
  };
})();

// Usage
getAbsoluteUrl('/something'); // https ://example.com/something

function isValidEmail(string) {
  string = string||'';
  var lastseg = (string.split('@')[1]||'').split('.')[1]||'',
      input = document.createElement('input');
      input.type = 'email';

  input.required = true;
  input.value = string;
  return !!(string && (input.validity &&
                       input.validity.valid) && 
                       lastseg.length);
}

console.log(isValidEmail('')); // -> false
console.log(isValidEmail('asda')); // -> false
console.log(isValidEmail('asda@gmail')); // -> false
console.log(isValidEmail('asda@gmail.com')); // -> true