dataCasting2.js

const MockData = require('./MockData')

const formatColumns = (data, columnLength = 6) => {
  const pushItem = ({ boardMatrix = [], columnCursor = 0, rowCursor = 0, currentItem }) => {
    const currentArrayItem = boardMatrix[columnCursor]
    if (!currentArrayItem) {
      boardMatrix[columnCursor] = [currentItem]
    } else {
      boardMatrix[columnCursor][rowCursor] = currentItem
    }
    return {
      columnCursor,
      rowCursor: ++rowCursor,
      boardMatrix
    }
  }

  const pushTailItem = (boardMatrix, columnCursor, rowCursor, tailItem) => {
    const arrayColumn = boardMatrix[columnCursor]
    if (!arrayColumn) {
      boardMatrix[columnCursor] = []
    }
    const arrayItem = boardMatrix[columnCursor][rowCursor]
    if (!arrayItem) {
      boardMatrix[columnCursor][rowCursor] = tailItem
      return boardMatrix
    }
    return pushTailItem(boardMatrix, columnCursor + 1, rowCursor, tailItem)
  }

  const { boardMatrix: result } = data.reduce((resultObject, currentItem) => {
    const { columnCursor = 0, rowCursor = 0, boardMatrix = []} = resultObject

    const columnExists = boardMatrix[columnCursor]
    const boardMatrixPrevItem = columnExists && boardMatrix[columnCursor][rowCursor - 1]
    const boardMatrixCurrentItem = columnExists && boardMatrix[columnCursor][rowCursor]

    const winningHandIsChanged = boardMatrixPrevItem && boardMatrixPrevItem.WinningHand !== currentItem.WinningHand

    if (winningHandIsChanged || !boardMatrixPrevItem) {
      return pushItem({
        ...resultObject,
        columnCursor: winningHandIsChanged ? columnCursor + 1 : columnCursor,
        rowCursor: winningHandIsChanged ? 0 : rowCursor,
        currentItem
      })
    }

    if (rowCursor === columnLength - 1 || boardMatrixCurrentItem) {
      return {
        columnCursor,
        rowCursor,
        boardMatrix: pushTailItem(
          boardMatrix,
          columnCursor + 1,
          boardMatrixCurrentItem ? rowCursor - 1 : rowCursor,
          currentItem
        )
      }
    }

    return pushItem({
      ...resultObject,
      currentItem
    })
  }, {})

  return result
}

const result = formatColumns(MockData, 6)
console.log(result)