Gas Optimizations

[code423n4]

Gas optimizations

• When checking if uint are equal to zero, using uint != 0 is cheaper than uint > 0. Applicable in lines 293, 327, 351, 427, 498, 598, 599

• Loops (lines 556, 594, 611, 627, 637, 647, 658, 670, 728, 742)

  • Cache loop length in stack instead of reading from memory every iteration. Replace for (...; i < arr.length; ...) { ... } with uint cachedLength = arr.length; for (...; i < cachedLength; ...) { ... }.
  • Use ++i for increments if the resulting value is not immediately needed. It costs less gas compared to i++ or i+=1 - as no temporary variable needs to exist in order to return the unincremented value.
  • Use unchecked arithmetic in counters, Solidity 0.8.x checks for overflow/underflow by default, which is not needed in this case. Replace for (...; ... ; ++i) { ... } with for (...; ...; ) { ... unchecked { ++i; } }