refactor-me.js

// Confused? See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Array_comprehensions

function flatten(previous, current) {
  return previous.concat(current)
}

var productImages = [
  for(section of CatalogSections) [
    for(placement of section.ProductPlacements) [
      for(item of placement.ProductPlacementItems) [
        for(image of item.Product.ProductImages) {
          manufacturerName: item.Product && item.Product.Manufacturer ?
              item.Product.Manufacturer.name : null,
          distributorPartNumber: item.distributor_part_number,
          manufacturerPartNumber: item.manufacturer_part_number,
          imageName: image.name
        }
      ].reduce(flatten, []).filter((product) => product.imageName)
    ].reduce(flatten, [])
  ].reduce(flatten, [])
].reduce(flatten, [])