# Circom Workshop 2

## Description​

The second circom workshop: we dig deeper into a few key circuits such as zk-group-sig, isZero, and Num2Bits.

• QuinSelector is a circuit that takes as input an array in[nElements], an index index, and outputs the value of in[index].
• RangeProof is a circuit that takes in upper lower and test, outputs 1 if test is in the range and 0 otherwise.