Gas Optimizations

[code423n4]

Using > 0 costs more gas than != 0 when used on a uint in a require() statement > 0

contracts\Community.sol:

  763          // Revert if repayment amount is zero.
  764:         require(_repayAmount > 0, "Community::!repay");



contracts\Project.sol:
  194          // Revert if try to lend 0
  195:         require(_cost > 0, "Project::!value>0");

It costs more gas to initialize variables to zero than to let the default of zero be applied

contracts\Project.sol:
  247          // Loop over all the new tasks.
  248:         for (uint256 i = 0; i < _length; i++) {
  249              // Increment local task counter.

  310          // Invite subcontractor for each task.
  311:         for (uint256 i = 0; i < _length; i++) {
  312              _inviteSC(_taskList[i], _scList[i], false);

  321          uint256 _length = _taskList.length;
  322:         for (uint256 i = 0; i < _length; i++) {
  323              tasks[_taskList[i]].acceptInvitation(_msgSender());

x = x + y is cheaper than x += y

contracts\Community.sol:
  422              .projectDetails[_project]
  423:             .totalLent += _amountToProject;
  424  

  434              .projectDetails[_project]
  435:             .lentAmount += _lendingAmount;
  436  

contracts\HomeFi.sol:
  288          // Project count starts from 1
  289:         projectCount += 1;
  290  

contracts\Project.sol:
  178          // Increment to ensure a set of data and signature cannot be re-used.
  179:         hashChangeNonce += 1;
  180  

  249              // Increment local task counter.
  250:             _taskCount += 1;
  251  

  289          // Increment to ensure a set of data and signature cannot be re-used.
  290:         hashChangeNonce += 1;
  291  

  439                      // Increase the difference of new cost and old cost to total allocated.
  440:                     totalAllocated += _newCost - _taskCost;
  441                  }

  710          for (uint256 _taskID = 1; _taskID <= _length; _taskID++) {
  711:             _cost += tasks[_taskID].cost;
  712          }

[zgorizzo69]

thanks for your work