[julia-users] Is there a function that performs (1:length(v))[v] for v a Vector{Bool} or a BitArray?

[Douglas Bates]

I realize it would be a one-liner to write one but, in the interests of not 
reinventing the wheel, I wanted to ask if I had missed a function that does 
this.  In R there is such a function called "which" but that name is 
already taken in Julia for something else.