Brief example from Sablier protocol to show one line if statements in Solidity

Sablier.sol

pragma solidity =0.5.17;

// import statements ...

/**
 * @title Sablier
 * @author Sablier
 * @notice Money streaming.
 */
contract Sablier is ISablier, ReentrancyGuard, CarefulMath {

    // functions and events (omitted for brievity) ....

    /**
     * @notice Withdraws from the contract to the recipient's account.
     * @dev Throws if the id does not point to a valid stream.
     *  Throws if the caller is not the sender or the recipient of the stream.
     *  Throws if the amount exceeds the available balance.
     *  Throws if there is a token transfer failure.
     * @param streamId The id of the stream to withdraw tokens from.
     * @param amount The amount of tokens to withdraw.
     */
    function withdrawFromStream(uint256 streamId, uint256 amount)
        external
        nonReentrant
        streamExists(streamId)
        onlySenderOrRecipient(streamId)
        returns (bool)
    {
    
        // omitted for brievity
        //    - check that the amount is not zero
        //    - retrieve the stream recipient balance

        // update the balance in the stream by removing the amount withdrawn
        MathError mathErr;
        (mathErr, streams[streamId].remainingBalance) = subUInt(stream.remainingBalance, amount);
        /**
         * `subUInt` can only return MathError.INTEGER_UNDERFLOW but we know that `remainingBalance` is at least
         * as big as `amount`.
         */
        assert(mathErr == MathError.NO_ERROR);

        if (streams[streamId].remainingBalance == 0) delete streams[streamId];

        IERC20(stream.tokenAddress).safeTransfer(stream.recipient, amount);
        emit WithdrawFromStream(streamId, stream.recipient, amount);
        return true;
    }
    
    // more functions (omitted for brievity) ...

}