Get name of object or class

Question

Is there any solution to get the function name of an object    function alertClassOrObject  o       window alert o objectName      myObj  OR  myClass  as a String    function myClass         this foo   function             alertClassOrObject this           var myObj   new myClass    myObj foo      for  var k in this        - there is no information about the className or ObjectName  Is it possible to get one of them

User · Answer

All we need    Wrap a constant in a function  where the name of the function equals the name of the object we want to get  Use arrow functions inside the object    x000D   x000D  console clear    x000D  function App       name of my constant is App x000D    return   x000D    a    x000D      b    x000D        c      gt      very important here  use arrow function  x000D          console log this constructor name  x000D          x000D        x000D      x000D    x000D    x000D  const obj   new App       usage x000D   x000D  obj a b c       App x000D   x000D     usage with react props etc   x000D     For instance  we want to pass this callback to some component x000D   x000D  const myComponent       x000D  myComponent customProps   obj a b c  x000D  myComponent customProps       App x000D   x000D   x000D

User · Answer

Get your object s constructor function and then inspect its name property   myObj constructor name   Returns  myClass

User · Answer

Example    x000D   x000D  function Foo      console log  Foo function      x000D  var Bar   function      console log  Bar function       x000D  var Abc   function Xyz     console log  Abc function       x000D   x000D  var f   new Foo    x000D  var b   new Bar    x000D  var a   new Abc    x000D   x000D  console log  f   f constructor name      - gt   Foo  x000D  console log  b   b constructor name      - gt   Function  x000D  console log  a   a constructor name      - gt   Xyz  x000D   x000D   x000D

User · Answer

I was facing a similar difficulty and none of the solutions presented here were optimal for what I was working on  What I had was a series of functions to display content in a modal and I was trying to refactor it under a single object definition making the functions  methods of the class  The problem came in when I found one of the methods created some nav-buttons inside the modal themselves which used an onClick to one of the functions -- now an object of the class  I have considered  and am still considering  other methods to handle these nav buttons  but I was able to find the variable name for the class itself by sweeping the variables defined in the parent window  What I did was search for anything matching the  instanceof  my class  and in case there might be more than one  I compared a specific property that was likely to be unique to each instance   var myClass   function varName        this instanceName     varName    null   amp  amp   typeof varName      string    amp  amp   varName           varName   null                  caching autosweep of window to try to find this instance s variable name              this getInstanceName   function             if this instanceName    null                        for z in window                    if  window z  instanceof myClass   amp  amp   window z  uniqueProperty     this uniqueProperty                         this instanceName   z                      break                                                    return this instanceName

User · Answer

Try this   var classname         obj constructor  split  function    1  split      0

User · Answer

As this was already answered  I just wanted to point out the differences in approaches on getting the constructor of an object in JavaScript  There is a difference between the constructor and the actual object class name  If the following adds to the complexity of your decision then maybe you re looking for instanceof  Or maybe you should ask yourself  Why am I doing this  Is this really what I am trying to solve    Notes   The obj constructor name is not available on older browsers  Matching   w   should satisfy ES6 style classes   Code   var what   function obj      return obj toString   match     w     1       var p      Normal obj with constructor  function Entity      p   new Entity    console log  constructor    what p constructor    name    p constructor name    class    what p        Obj with prototype overriden  function Player     console warn  Player constructor called       Player prototype   new Entity    p   new Player    console log  constructor    what p constructor    name    p constructor name   class    what p        Obj with constructor property overriden  function OtherPlayer     console warn  OtherPlayer constructor called       OtherPlayer constructor   new Player    p   new OtherPlayer    console log  constructor    what p constructor    name    p constructor name   class    what p        Anonymous function obj  p   new Function      console log  constructor    what p constructor    name    p constructor name   class    what p        No constructor here  p       console log  constructor    what p constructor    name    p constructor name   class    what p        ES6 class  class NPC      constructor           p   new NPC    console log  constructor    what p constructor    name    p constructor name    class    what p        ES6 class extended class Boss extends NPC     constructor         super          p   new Boss    console log  constructor    what p constructor    name    p constructor name    class    what p      Result     Code  https   jsbin com wikiji edit js console

User · Answer

If you use standard IIFE  for example with TypeScript    var Zamboch   function   Zamboch         function  Web             function  Common                var App    function                      function App                                       App prototype hello   function                          console log  Hello App                                       return App                                Common App   App             Web Common     Web Common                 var Common   Web Common          Zamboch Web      Zamboch Web             var Web    Zamboch Web     Zamboch     Zamboch           you could annotate the prototypes upfront with   setupReflection Zamboch   Zamboch    Zamboch      and then use  fullname and  classname fields   var app new Zamboch Web Common App    console log app  fullname     annotating function here   function setupReflection ns  fullname  name           I have only classes and namespaces starting with capital letter     if  name 0   gt    A   amp  amp  name 0   amp lt    Z             var type   typeof ns          if  type     object                 ns  refmark   ns  refmark    0              ns  fullname   fullname              var keys   Object keys ns               if  keys length    ns  refmark                       set marker to avoid recusion  just in case                  ns  refmark   keys length                  for  var nested in ns                        var nestedvalue   ns nested                       setupReflection nestedvalue  fullname         nested  nested                                             else if  type     function   amp  amp  ns prototype                ns  fullname   fullname              ns  classname   name              ns prototype  fullname   fullname              ns prototype  classname   name                      JsFiddle

[javascript] Get name of object or class

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