you can simple try
'01010101' | 0
so, don't use them, just parseInt('01010101', 2)
Instructing people to use one method while not using another without any explanation does not do the community any good. Please stop and explain the purpose of this pro-tip.
For the record, both the unary + operator and bitwise operators | coerce variables to numbers on a base 10. This works for most cases unless the number needs to be interpretted as binary. In that case, you may also use parseInt with the radix (base) of 2 to interpret it.
If you are going to use parseInt without specifying a radix, beware that it will attempt to do octal if the number begins with 0 and otherwise fall back to base 10. This is why most people say it is best to always specify a radix with parseInt. I use + since it is simpler and has the same effect.
I don't see anything wrong with +'01010101' or '01010101' | 0