sodukuCritique.js

exports.default = complete(grid) => {
  // not really necessary but not a negative either, this function can just be init code at the top
  createGrid = createGrid() => {}
  
  // again, this function can be init code if you want it to be, not important
  identifyMissing = identifyMissing() => {}
  
  // now you don't have to pass around `grid` all the time, your functions aren't as pure but this isn't really
  // a functional programming style anyway and it's fine in this instance to be honest
  availableRow = availableRow(row, num) => {}
  availableCol = availableCol(col, num) => {}
  availableSquare = availableSquare(col, row, num) => {}
  
  availableAll = availableAll(col, row, num) => {}
  iterateNums = iterateNums(missingNums)

  return iterateNums(grid, missingNums)
}