Getting the object s property name

Question

I was wondering if there was any way in JavaScript to loop through an object like so   for var i in myObject                   But get the name of each property like this   for var i in myObject        separateObj myObject i  name    myObject i       I can t seem to find anything like it on Google  They say to pass the names of the variables with them but this is not an option for what I am trying to achieve   Thanks for any help you can offer

User · Answer

you can easily iterate in objects   eg  if the object is  var a    a  apple   b  ball   c  cat   d  doll   e  elephant     Object keys a  forEach key   gt       console log key     returns the keys in an object    console log a key       returns the appropriate value

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As of 2018   You can make use of Object getOwnPropertyNames   as described in Developer Mozilla Documentation  const object1       a  1    b  2    c  3     console log Object getOwnPropertyNames object1       expected output  Array   a    b    c

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Quick  amp  dirty   function getObjName obj      return  wrap  obj    amp  amp  eval  for p in obj  p     amp  amp   wrap null

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When you do the for in loop you put up first  i is the property name  So you have the property name  i  and access the value by doing myObject i

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These solutions work too      Solution One function removeProperty obj  prop      var bool    var keys   Object keys obj     for  var i   0  i  lt  keys length  i          if  keys i      prop          delete obj prop         bool   true               return Boolean bool         Solution two function removeProperty obj  prop      var bool    if  obj hasOwnProperty prop           bool   true        delete obj prop         return Boolean bool

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IN ES5  E G  you have this kind of object   var ELEMENTS         STEP ELEMENT    ID   0   imageName   el 0 png         GREEN ELEMENT    ID   1   imageName   el 1 png         BLUE ELEMENT    ID   2   imageName   el 2 png         ORANGE ELEMENT    ID   3   imageName   el 3 png         PURPLE ELEMENT    ID   4   imageName   el 4 png         YELLOW ELEMENT    ID   5   imageName   el 5 png         And now if you want to have a function that if you pass  0  as a param - to get  STEP ELEMENT   if  2  to get  BLUE ELEMENT  and so for  function elementId        var element   null       Object keys ELEMENTS  forEach function key            if ELEMENTS key  ID     elementId toString                 element   key              return                             return element      This is probably not the best solution to the problem but its good to give you an idea how to do it   Cheers

User · Answer

Other than  Object keys  obj     we have very simple  for   in  loop - which loops over enumerable property names of an object    x000D   x000D  const obj     fName   John   lName   Doe    x000D   x000D  for  const key in obj    x000D        This will give key x000D        console log key   x000D        This will give value x000D      console log obj key    x000D       x000D    x000D   x000D   x000D

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Use Object keys      x000D   x000D  var myObject     a   c   b   a   c   b     x000D  var keyNames   Object keys myObject   x000D  console log keyNames      Outputs   a   b   c   x000D   x000D   x000D    Object keys   gives you an array of property names belonging to the input object

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To get the property of the object or the  array key  or  array index  depending on what your native language is      Use the Object keys   method     Important  this is only compatible with  Modern browsers    So if your object is called  myObject     var c   0  for c in myObject        console log Object keys myObject c         Walla   This will definitely work in the latest firefox and ie11 and chrome     Here is some documentation at MDN https   developer mozilla org en-US docs Web JavaScript Reference Global Objects Object keys

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Using Object keys   function for acquiring properties from an Object  and it can help search property by name  for example   const Products   function        this Product    Product A       this Price   9 99      this Quantity   112         Simple find function case insensitive let findPropByName   function data  propertyName    let props        Object keys data  forEach element   gt        return props push element toLowerCase             console log props     let i   props indexOf propertyName toLowerCase        if i  gt  -1       return props i         return false         calling the function let products   new Products    console log findPropByName products   quantity

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for direct access a object property by position    generally usefull for property  0     so it holds info about the further    or in node js  require cache 0   for the first loaded external module  etc  etc   Object keys  myObject    0   Object keys  myObject    1       Object keys  myObject    n

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i is the name   for var name in obj        alert name       var value   obj name       alert value       So you could do   seperateObj i    myObject i

User · Answer

Disclaimer  I misunderstood the question to be   Can I know the property name that an object was attached to   but chose to leave the answer since some people may end up here while searching for that     No  an object could be attached to multiple properties  so it has no way of knowing its name   var obj    a 1   var a    x  obj  y  obj    What would obj s name be   Are you sure you don t just want the property name from the for loop   for  var propName in obj      console log  Iterating through prop with name   propName    its value is    obj propName

[javascript] Getting the object's property name

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