javascript variable reference alias

Question

Is it possible in javascript to assign an alias reference to a local var someway   I mean something C-like   function foo       var x   1    var y    amp x    y      alert x      prints 2        EDIT    Is it possible to alias arguments callee in this code    function foo       arguments callee myStaticVar   arguments callee myStaticVar    0    arguments callee myStaticVar      return arguments callee myStaticVar

User · Answer

To some degree this is possible  you can create an alias to a variable using closures   Function prototype toString   function         return this       var x   1  var y   function     return x   x    alert y      prints 2  no need for    because of toString redefinition

User · Answer

Whether you can alias something depends on the data type   Objects  arrays  and functions will be handled by reference and aliasing is possible   Other types are essentially atomic  and the variable stores the value rather than a reference to a value   arguments callee is a function  and therefore you can have a reference to it and modify that shared object   function foo       var self   arguments callee    self myStaticVar   self myStaticVar    0    self myStaticVar      return self myStaticVar      Note that if in the above code you were to say self   function    return 42    then self would then refer to a different object than arguments callee  which remains a reference to foo   When you have a compound object  the assignment operator replaces the reference  it does not change the referred object   With atomic values  a case like y   is equivalent to y   y   1  which is assigning a  new  integer to the variable

User · Answer

Expanding on user187291 s post  you could also use getters setters to get around having to use functions   var x   1  var ref         get x      return x         set x v    x   v        ref x     console log x      prints  2  x--  console log ref x      prints  1

User · Answer

edit to my previous answer  if you want to count a function s invocations  you might want to try   var countMe     function       var c   0     return function         c        return c             alert countMe        Alerts  1  alert countMe        Alerts  2    Here  c serves as the counter  and you do not have to use arguments callee

User · Answer

in 2019 I need to write minified jquery plugins so I need it too this alias and so testing these examples and others  from other sources I found a way without copy in the memory of whe entire object  but creating only a reference  I tested this already with firefox and watching task manager s tab memory on firefox before  The code is   var  p  d    p  document   console log d body

User · Answer

In JavaScript  primitive types such as integers and strings are passed by value whereas objects are passed by reference  So in order to achieve this you need to use an object      declare an object with property x var obj     x  1    var aliasToObj   obj  aliasToObj x     alert  obj x       displays 2

[javascript] javascript variable reference/alias

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