var getAbsoluteUrl = (function() {

    var a;

​

    return function(url) {

        if(!a) a = document.createElement('a');

        a.href = url;

​

        return a.href;

    };

})();

​

// Usage

console.log(getAbsoluteUrl('/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