Adding elements to object

Question

I need to populate a json file  now I have something like this     element    id  10  quantity  1     And I need to add another  element   My first step is putting that json in a Object type using cart   JSON parse  now I need to add the new element  I supposed I must use cart push to add another element  I tried this   var element       element push   id  id  quantity  quantity     cart push element     But I got error  Object has no method push  when I try to do element push  and I think I m doing something VERY wrong because I m not telling the  element  anywhere   How can I do that   Edit  sorry to all I had a LOT of confusion in my head   I thought I can get only object type when taking data from JSON parse  but I get what I put in the JSON in the first place   Putting array instead of object solved my problem  I used lots of suggestions got here too  thank you all

User · Answer

With that row  var element         you define element to be a plain object  The native JavaScript object has no push   method  To add new items to a plain object use this syntax   element  yourKey     yourValue    On the other hand you could define element as an array using  var element         Then you can add elements using push

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function addValueInObject value  object  key             var addMoreOptions   eval         key           value                  if addMoreOptions    null                var textObject   JSON stringify object               textObject   textObject substring 1 textObject length-1               var AddElement   JSON stringify addMoreOptions               object   eval       textObject        AddElement substring 1 AddElement length-1                            return object         addValueInObject  sdfasfas   yourObject   keyname      OR    var obj     key   value     obj key2    value2

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Adding new key pair elements into the original object  const obj     a 1  b 2   const add     c 3  d 4  e    x   y   z      Object entries add  forEach   key value     gt    obj key    value     obj new value   a  1  b  2  c  3  d  4  e    quot x quot    quot y quot    quot z quot

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if you not design to do loop with in JS e g  pass to PHP to do loop for you  let decision      decision code     row    event target value   this concept may help a bit

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If anyone comes looking to create a similar JSON  just without using cart as an array  here goes   I have an array of objects myArr as   var myArr     resourceType  myRT               id  1              value  ha                 resourceType  myRT               id  2              value  he                 resourceType  myRT               id  3              value  Li       and I will attempt to create a JSON with the following structure       1    resourceType   myRT   id   1   value   ha      2    resourceType   myRT   id   2   value   he      3    resourceType   myRT   id   3   value   Li       you can simply do-  var cart       myArr map function myObj                       cart myObj id   myObj

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To append to an object use Object assign  var ElementList      function addElement  ElementList  element        let newList   Object assign ElementList  element      return newList   console log ElementList    Output        element    id  10  quantity  1   element    id  11  quantity  2

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I was reading something related to this try if it is useful   1 Define a push function inside a object   let obj  push function push element      push call this element       Now you can push elements like an array  obj push 1  obj push  a 1   obj push  1 2 3     This will produce this object  obj    0  1  1   a  1   2   3   1  2  3   length  3     Notice the elements are added with indexes and also see that there is a new length property added to the object This will be useful to find the length of the object too This works because of the generic nature of push   function

User · Answer

you should write var element       in javascript    is an empty object and    is an empty array

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function addValueInObject object  key  value        var res           var textObject   JSON stringify object       if  textObject                     res   JSON parse        key           value                else           res   JSON parse       textObject substring 1  textObject length - 1           key           value                    return res      this code is worked

User · Answer

cart push   element    id  id  quantity  quantity

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This is an old question  anyway today the best practice is by using Object defineProperty  const object1        Object defineProperty object1   property1       value  42    writable  false      object1 property1   77     throws an error in strict mode  console log object1 property1      expected output  42

User · Answer

For anyone still looking for a solution  I think that the objects should have been stored in an array like     var element       cart       element id   id  element quantity   quantity  cart push element     Then when you want to use an element as an object you can do this     var element   cart find function  el    return el id      id that we want        Put a variable at  id that we want  and give it the id of the element that we want from our array  An  elemnt  object is returned  Of course we dont have to us id to find the object  We could use any other property to do the find

User · Answer

Your element is not an array  however your cart needs to be an array in order to support many element objects  Code example   var element       cart       element id   id  element quantity   quantity  cart push element     If you want cart to be an array of objects in the form   element    id  10  quantity  1    then perform   var element       cart       element id   id  element quantity   quantity  cart push  element  element      JSON stringify   was mentioned as a concern in the comment    gt  gt  JSON stringify   a  1    a  2               a  1    a  2

User · Answer

push is an method of arrays   so for object you can get the index of last element  and you can probably do the same job as push for object as below  var lastIndex   Object keys element  Object keys element  length-1     then add object to the new index of element  element parseInt lastIndex   1      id  id  quantity  quantity

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Try this   var data     field  Data  type  date      field  Numero  type  number      var columns        var index   0     each data  function          columns index              field   this field          type   this type             index         console log columns

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My proposition is to use different data structure that proposed already in other answers - it allows you to make push on card elements and allow to expand card properties   x000D   x000D  let card       elements          id  10  quantity  1            other card fields like  owner  or something       card elements push   id  22  quantity  3    console log card   x000D   x000D   x000D

User · Answer

If the cart has to be stored as an object and not array  Although I would recommend storing as an     you can always change the structure to use the ID as the key   var element     quantity  quantity    cart id    element    This allows you to add multiple items to the cart like so   cart  1       quantity  5   cart  2       quantity  10       Cart is now        1     quantity  5     2     quantity  10

[javascript] Adding elements to object

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