Adding a custom variable as JSON attribute

Question

I'm trying to build a JS object with a custom attribute name. Basically I want to create a Schema based on the root element. ("items" if type is array and "properties" if type is object)

    var helperObj = type.toLowerCase() === "array" ? "items" : "properties";
    var newSchema = {
        "title": title,
        "type": type,
        helperObj.toString() : {}
    };

The above gives a syntax error:

SyntaxError: missing : after property id

Then I tried to parse a String as a JSON.

    var schemaString="{ \"title\":"+title+", \"type\":"+type.toLowerCase()+","+helperObj+":{}  }";
    var newSchema=JSON.parse(schemaString);

This gives an error saying:

SyntaxError: JSON.parse: unexpected character at line 1 column 11 of the JSON data

How can I get a JS object as desired?

If you are using ES6, you can write { [helperObj]: {} }. Also read this. — Aᴍɪʀ
– Aᴍɪʀ, Commented Oct 31, 2016 at 6:22
@Aᴍɪʀ it worked and the method in the post too worked. Thanks. — S.Dan
– S.Dan, Commented Oct 31, 2016 at 6:31

notgiorgi · Accepted Answer · 2016-10-31 06:29:49Z

3

You could do

var helperObj = type.toLowerCase() === "array" ? "items" : "properties";
var newSchema = {
    "title": title,
    "type": type,
};

newSchema[helperObj] = {};

or use if you're using es6:

var helperObj = type.toLowerCase() === "array" ? "items" : "properties";
var newSchema = {
    "title": title,
    "type": type,
    [helperObj] : {}
};

answered Oct 31, 2016 at 6:29

notgiorgi

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