This question pertains to frequency domain filtering. I'd like to multiply an IIR filter's frequency response by a buffer of samples that have been FFT'd. I get how I'd evaluate an FIR, I'd FFT and zero-pad it (is this assumption correct?).
For an IIR would I just evaluate the impulse response of the IIR for a sequence 1 followed by N zeros where N is the length of the FFT, and then FFT that impulse response. Is this the right approach? Don't want to go too far down the rabbit hole without catching any caveats beforehand.