Game - helpers

helpers.tsx

export const createTable = (rowNum: number, cellNum: number): number[][] => {
  const row: number[] = Array(rowNum).fill(0);
  const table: number[][] = Array(cellNum)
    .fill(row)
    .map((row: number[]) => [...row]);

  return table;
};

export const recalculateTable = (table: number[][], index: number, value: number): number[][] => {
  return table.map((row: number[], i: number) => {
    if (index === i) {
      let emptyCell: number = row.indexOf(0);

      row[emptyCell] = value;
    }

    return [...row];
  });
};

const checkVertical = (table: number[][]) => {
  for (let r = 3; r < 7; r++) {
    for (let c = 0; c < 6; c++) {
      if (table[r][c]) {
        if (
          table[r][c] === table[r - 1][c] &&
          table[r][c] === table[r - 2][c] &&
          table[r][c] === table[r - 3][c]
        ) {
          return table[r][c];
        }
      }
    }
  }
};

const checkHorizontal = (table: number[][]) => {
  for (let r = 0; r < 7; r++) {
    for (let c = 0; c < 4; c++) {
      if (table[r][c]) {
        if (
          table[r][c] === table[r][c + 1] &&
          table[r][c] === table[r][c + 2] &&
          table[r][c] === table[r][c + 3]
        ) {
          return table[r][c];
        }
      }
    }
  }
};

const checkDiagonalRight = (table: number[][]) => {
  for (let r = 3; r < 7; r++) {
    for (let c = 0; c < 5; c++) {
      if (table[r][c]) {
        if (
          table[r][c] === table[r - 1][c + 1] &&
          table[r][c] === table[r - 2][c + 2] &&
          table[r][c] === table[r - 3][c + 3]
        ) {
          return table[r][c];
        }
      }
    }
  }
};

const checkDiagonalLeft = (table: number[][]) => {
  for (let r = 3; r < 6; r++) {
    for (let c = 3; c < 7; c++) {
      if (table[r][c]) {
        if (
          table[r][c] === table[r - 1][c - 1] &&
          table[r][c] === table[r - 2][c - 2] &&
          table[r][c] === table[r - 3][c - 3]
        ) {
          return table[r][c];
        }
      }
    }
  }
};

const checkDraw = (table: number[][]) => {
  for (let r = 0; r < 6; r++) {
    for (let c = 0; c < 7; c++) {
      if (table[r][c] === 0) {
        return 0;
      }
    }
  }

  return 'draw';
};

export const checkWinner = (table: number[][]) => {
  return (
    checkVertical(table) ||
    checkDiagonalRight(table) ||
    checkDiagonalLeft(table) ||
    checkHorizontal(table) ||
    checkDraw(table)
  );
};