Issue detected with JavaScript object attribute containing hyphens prompts troubleshooting effort

Question

Issue detected with JavaScript object attribute containing hyphens prompts troubleshooting effort

I received a JSON response in the following structure.

 {
  "_meta" : {
               "next-person-id" : "1001",
               "totalPersons" : "1000"
            }
 }

Utilizing Angular's $http service, I am attempting to retrieve this data and access the next-person-id property in JavaScript as shown below:

  $http.get(url).then(
        function(response){
              console.log(response._meta.next-person-id);
        }
  );

However, whenever I try to access the next-person-id attribute in the response, it always returns as undefined. Strangely, I can successfully access the totalPersons attribute. Could there be an issue with retrieving attributes containing '-' characters in JavaScript?

javascript angularjs

Answer 1

Answer №1

Here is an example using bracket notation:

console.log(response._meta['next-person-id']);

An alternative approach would be to modify the keys by replacing hyphens with underscores, allowing for _meta.next_person_id to function as well.

Answer 2

Here is an example using bracket notation:

console.log(response._meta['next-person-id']);

An alternative approach would be to modify the keys by replacing hyphens with underscores, allowing for _meta.next_person_id to function as well.

Answer 3

Answer №2

One cannot use a hyphen to define variables as it may be mistaken for a subtraction sign.

The solution is to utilize square bracket notation:

console.log(data._info['previous-user-id']);

Answer 4

One cannot use a hyphen to define variables as it may be mistaken for a subtraction sign.

The solution is to utilize square bracket notation:

console.log(data._info['previous-user-id']);

Answer 5

Answer №3

That's correct, because when working with JavaScript, you have the flexibility to use Latin letters, numbers, as well as symbols like $ and _ for variables or properties.

If you need to include a - in your variable name, you must wrap it in string quotes, like this:

var obj = {
   'next-person-id': 2
}

console.log(obj['next-person-id']); // 2

Explanation:

In the Global scope, using a - sign will be interpreted as subtraction. This can lead to errors if not enclosed properly, such as:

ReferenceError: name is not defined

In JavaScript, you have two ways of accessing object properties:

1) Using Dot notation

obj.property

2) Using Square bracket notation

obj['property']

When using square brackets, ensure that you are passing a string argument, as any symbols are valid within the string except for the string quote symbol which would prematurely close the string.

Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_Accessors#Bracket_notation

Answer 6

That's correct, because when working with JavaScript, you have the flexibility to use Latin letters, numbers, as well as symbols like $ and _ for variables or properties.

If you need to include a - in your variable name, you must wrap it in string quotes, like this:

var obj = {
   'next-person-id': 2
}

console.log(obj['next-person-id']); // 2

Explanation:

In the Global scope, using a - sign will be interpreted as subtraction. This can lead to errors if not enclosed properly, such as:

ReferenceError: name is not defined

In JavaScript, you have two ways of accessing object properties:

1) Using Dot notation

obj.property

2) Using Square bracket notation

obj['property']

When using square brackets, ensure that you are passing a string argument, as any symbols are valid within the string except for the string quote symbol which would prematurely close the string.

Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_Accessors#Bracket_notation

Issue detected with JavaScript object attribute containing hyphens prompts troubleshooting effort

Answer №1

Answer №2

Answer №3

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