Access non-numeric Object properties by index

Question

If I have an array like this   var arr     one   two   three      I can access different parts by doing this   console log arr 1      How can I access object properties by their order rather than by key   Example   var obj          something     awesome        evenmore      crazy     jbo          evenmore      crazy        something     awesome       How would I get the first property for each object    something  from obj and  evenmore  from jbo   without explicitly using the property name   Now  a few of you seem to think I m after something like   console log obj  something       This is not the case  I m specifically looking to target the index  just like the first example - if it s possible

User · Answer

The only way I can think of doing this is by creating a method that gives you the property using Object.keys();.

var obj = {
    dog: "woof",
    cat: "meow",
    key: function(n) {
        return this[Object.keys(this)[n]];
    }
};
obj.key(1); // "meow"

Demo: http://jsfiddle.net/UmkVn/

It would be possible to extend this to all objects using Object.prototype; but that isn't usually recommended.

Instead, use a function helper:

var object = {
  key: function(n) {
    return this[ Object.keys(this)[n] ];
  }
};

function key(obj, idx) {
  return object.key.call(obj, idx);
}

key({ a: 6 }, 0); // 6

User · Answer

I m specifically looking to target the index  just like the first example - if it s possible     No  it isn t possible   The closest you can get is to get an Array of the object s keys  and use that   var keys   Object keys  obj         but there s no guarantee that the keys will be returned in the order you defined  So it could end up looking like   keys  0         evenmore  keys  1         something

User · Answer

If you are not sure Object keys   is going to return you the keys in the right order  you can try this logic instead  var keys      var obj          key1     value1        key2     value2        key3     value3     for  var key in obj       keys push key    console log obj keys 1    console log obj keys 2    console log obj keys 3

User · Answer

I went ahead and made a function for you   x000D   x000D   Object prototype getValueByIndex   function  index                     Object getOwnPropertyNames   takes in a parameter of the object            and returns an array of all the properties           In this case it would return    something   evenmore             So  this Object getOwnPropertyNames this  index    is really just the same thing as           this propertyName             return this Object getOwnPropertyNames this  index        let obj          something     awesome        evenmore      crazy      console log obj getValueByIndex 0       Expected output   awesome  x000D   x000D   x000D

User · Answer

you can create an array that filled with your object fields and use an index on the array and access object properties via that  propertiesName   pr1   pr2   pr3    this myObject this propertiesName 0

User · Answer

You can use the Object values   method if you dont want to use the Object keys      As opposed to the Object keys   method that returns an array of a given object s own enumerable properties  so for instance   const object1      a   somestring    b  42   c  false     console log Object keys object1      Would print out the following array      a    b    c      The Object values   method returns an array of a given object s own enumerable property values   So if you have the same object but use values instead   const object1      a   somestring    b  42   c  false     console log Object values object1      You would get the following array      somestring   42  false     So if you wanted to access the object1 b  but using an index instead you could use   Object values object1  1      42   You can read more about this method here

User · Answer

by jquery you can do this   var arr     map obj function value  key        return value      alert obj 0

User · Answer

Get the array of keys  reverse it  then run your loop    var keys   Object keys  obj   reverse      for var i   0  i  lt  keys length  i         var key   keys i       var value   obj key         do stuff backwards

User · Answer

var obj          key1   value        2   value        key 1   value     console log obj key1  console log obj  key1    console log obj  2    console log obj  key 1        will not work console log obj 2    Edit       I m specifically looking to target the index  just like the first example - if it s possible     Actually the  index  is the key  If you want to store the position of a key you need to create a custom object to handle this

[javascript] Access non-numeric Object properties by index?

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