Variable into Json Object - Javascript

Question

I have this code:

function my_json_function(my_variable) {
    var json_var = {
        my_variable: [{
            "firstName": "John",
            "lastName": "Doe"
        }, {
            "firstName": "Anna",
            "lastName": "Smith"
        }]
    };

    return json_var;
}

So, the problem is:

I pass to the function a variable named my_variable, and I want to assign it to the name of the json group.

So, I explain what I mean: For example if my_variable = "employees", the function have to produce the following result:

"employees":[
    {"firstName":"John", "lastName":"Doe"}, 
    {"firstName":"Anna", "lastName":"Smith"}
]

I've tried to casting like this: String(my_variable), but it return me the error:

Uncaught SyntaxError: Unexpected token :

where am I wrong? thanks

Matt Zeunert · Accepted Answer · 2015-07-06 09:28:54Z

3

You'll need to use an assignment with brackets instead:

var json_var = {};
json_var[my_variable] = [
    {"firstName":"John", "lastName":"Doe"}, 
    {"firstName":"Anna",    "lastName":"Smith"}
];

Inside the object literal it isn't possible to have a dynamic key name based.

answered Jul 6, 2015 at 9:28

Matt Zeunert

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3 Comments

J261 Over a year ago

this is not what he wants, he first needs to clone the old data

Matt Zeunert Over a year ago

@Vorge What do you mean?

Tushar Over a year ago

For example if my_variable = "employees", the function have to produce the following result:

Tushar · Accepted Answer · 2015-07-06 09:30:20Z

2

See the comments inline in the code:

function my_json_function(my_variable) {
    var json_var = {
        peoples: [{
            "firstName": "John",
            "lastName": "Doe"
        }, {
            "firstName": "Anna",
            "lastName": "Smith"
        }]
    };

    var obj = {}; // Create empty object
    obj[my_variable] = json_var.peoples; // Assign the data  in the new key

    return obj; // return newly created object
}

answered Jul 6, 2015 at 9:30

Tushar

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Comments

Jonathon Blok · Accepted Answer · 2015-07-06 09:48:17Z

0

You need to use bracket notation rather than dot notation.

function my_json_function(my_variable) {
    var json_var = {};
    json_var[my_variable] = [{
        "firstName": "John",
        "lastName": "Doe"
    }, {
        "firstName": "Anna",
        "lastName": "Smith"
    }];

    return json_var;
}

Note the use of json_var[my_variable] with square brackets. This will create a property in the object with whatever variable is passed in.

answered Jul 6, 2015 at 9:48

Jonathon Blok

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