Detect length of binary string?

[hanyuone]

Maybe a built-in that would detect the length of a binary string?

var a=1111
out #a

This should return 100.

[somebody1234]

@DerpfacePython But that's used for comments, used $ instead, should be easy for you to change it yourself

[hanyuone]

Ah, yeah, I forgot. Was too tired yesterday...