CODEWITHSUNDEEP
javascriptjquery
Hello-World
Hello-World

Reputation: 9545

identify object property by placement in object

How do you identify an object by its place in the object.

myObj.b = 2

can I go somethiong like myObj[1] to show 2 also?

var myObj = {
    a: 1,
    b: 2,
    c: 3,
    d: 4,
    e: 5,
    f: 6
}

Upvotes: 1

Views: 135

Answers (2)

ThiefMaster
ThiefMaster

Reputation: 318498

No, this is not possible. An object property has no position as objects are not ordered.

You have to choose between:

  • Arrays: Consecutive keys from the range [0..length), in order.
  • Objects: Arbitrary keys, no guaranteed order.

A possible workaround would be creating both an object and an array and then using the object for key-based access and the array for index-based. You could then use the array to get the index(es) for a given value.

Upvotes: 8

user504674
user504674

Reputation:

No, myObj[1] will result in undefined. Object literals are hash maps (key, value stores), which do not support indexed based access. This is so because items in a hash do not have a predictable order of iteration.

What you can do, to get the flavor of an index going with your object fields, is:(in jQuery)

$.each(myObj, function(index, element) {
    console.log(index + ' : ' + element)
});

In plain javascript, you could iterate over the fields using a for in loop, as shown:

for (key in myObj) {
   console.log(key);
   console.log(myObj[key]);
}

(Note: Your literal has syntax errors).

Upvotes: 2

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