hashrocket - javascript object in rocket syntax -

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I want to get value from this hash in Java: 

  hash = {: hash . User_authenticated] hash ["user_authenticated"] hash [: user_authenticated]   
 Nothing works, I get this error:  
  SyntaxError: Invalid property id    
 
 
 Javascript objects did not express the rubbish ashes on rocket cement Can go. Like ECMAScript 6 is adopted, Javascript implementation has the same symbol for  anonymous function definitions ;  = & gt; , although they are referred to as  arrows instead of  hash rockets  instead of  fat arrows  Does.  
 For simple tasks, there is no difference between the definitions and arrays with the arrow syntax and the traditional functions.  
  var foo = function (s) {return s.toString ()}   
 and  
  function fu ( S) are equal to {return s.toString ()}   
:  
  var foo = (s) => {Return s.toString ()}   
 Additionally, these are equal to both:  
  var foo = (s) => S.toString ()   
 Also:  
  const foo = s => However, while using  this , selection between traditional and arrow works is important, because traditionally defined functions create a new opportunity for . This example is licensed under , whereas the arrows do not work:  
  function person () {// person () creator as an example of himself `It` defines this.age = 0; SetInterval (function growUp () {// In non-rigid mode, the growUp () function defines `as` // global object, the person () is different from` it` // defined by the constructor. Age ++;}, 1000); } Var p = new person ();   
 Here,  p.age  will always be 0 because  age  has increased which falls under  this  The only internal function that exists, is not an example of  person , which is the  p . When the internal function is defined as an Arrow function:  
  function person () {// person () creator defines itself as an example of this. Age = 0; SetInterval ((=) = & gt; {// In non-rigid mode, the growUp () function defines `as` // as the global object, which defined by the person () define` it` // This.age ++;}, 1000); } Var p = new person (); Since  P , the number of seconds will be equal to because  this  was created because  this  is the example of the  internal function  .  
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