Accessing javascript object with string value

Question

I don't understand why can't i access values like this:

object = {
    test:{
        value: "Hello world"
    }
}

variable = "value";

//this gives me "Hello world"
console.log(object.test.value);

//this gives me undefined error
console.log(object.test.variable);

By now i can understand that it can't be done this way, but i still need to give some value to the variable and then use that variable to access object values.

possible duplicate of javascript object, access variable property name? — Bergi
– Bergi, Commented Jun 26, 2012 at 18:51

Jonathan M · Accepted Answer · 2012-06-26 18:48:10Z

17

Do it this way:

console.log(object.test[variable]);

Doing it with dots is using literal attribute names. I.e., object.test.value equates to object.test['value'].

answered Jun 26, 2012 at 18:48

Jonathan M

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Comments

gen_Eric · Accepted Answer · 2012-06-26 18:48:19Z

3

You need to do

object.test[variable]

Objects can be accessed using both . and [].

object.test.variable is looking for the literal property "variable", which doesn't exist.

answered Jun 26, 2012 at 18:48

gen_Eric

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Comments

Alex · Accepted Answer · 2023-11-24 14:40:27Z

0

Actually it is doable by JSON path

For instance: https://jsonpath.com/

answered Nov 24, 2023 at 14:40

Alex

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