Javascript Object - Key beginning with number, allowed?

Question

Is this allowed?

myObj = {};
myObj[\'4a56546s6d\']

Or the key must start with a letter like:

myObj = {};
myObj[\'x4a56546s6         


        

Answer 1

You can use any key if you use [string] to access the key, even key with space. All of these are valid:

myObj['key with space']
myObj['12345']

But if you want to use dot . operator to access the key then the key must be a valid identifier which means they can not begin with a number or contain space.