Question

I have an Object obj which has a property “value” with a value of 123. When I console.log(obj) I see firefox print the object with all its fields.

When I try to print the value of the “value” property, I get undefined.

I tried:

console.log(obj.value);

and

console.log(obj[value]);

What am I doing wrong?

Answer 1

If your object has got value which looks like this:

obj={value:"Object Value"};

then obj.value and obj['value'] is valid.

 console.log (obj.value); //Output will be 'Object Value'
 console.log (obj['value']); //Again output will be same 'Object Value'​​​​​​​​​​​​​​​​​​​​

In javascript you can use square brackets and dot notation almost interchangeably.

More information on dot vs square bracket notations