getNumReadonlyNonSigners method
Counts the number of accounts that are non signers and readonly.
Implementation
int getNumReadonlyNonSigners() =>
    fold(0, (total, account) => total + (!account.isWriteable && !account.isSigner ? 1 : 0));Counts the number of accounts that are non signers and readonly.
int getNumReadonlyNonSigners() =>
    fold(0, (total, account) => total + (!account.isWriteable && !account.isSigner ? 1 : 0));