connect-four.js

omg.js

"use strict";

const board = [
  [t,f,t,f],
  [f,f,f,f],
  [f,f,f,f],
  [f,t,f,f],
]

/*
  0 1 2 3 4 5 6 7 8
0 O O O O O O O O B      B = Winning col
1 X O O O A O O O B
2 O X O O O A O O B 
3 O O X O O O A O B 
4 O O O X O O O A O       X and A = Winning DownRight Diagonals
5 O O O O O O O O A
6 O O O O O O O E O 
7 O Y Y Y Y O E O O         Y = Winning row
8 O O O O O E O O O
9 O O O O E O O O O       E = Winning DownLeft Diagonal
*/
const determineDiagonal = (width, height, x, y) => 

const aggregateBoard = board => {
    const width = board[0].length;
    const height = board.length;
  
    return Object.values(board
      .reduce((acc, row, rowIndex) =>
        row.reduce((acc2, slot, columnIndex) => {
          const columnName = `column${columnIndex}`;
          const rowName = `row${rowIndex}`;
          const drDiagonalName = `drDiag${determineDiagonal(...)}`;
          const dlDiagonalName = `dlDiag${...}`;
          
          if (!acc2[columnName] || Array.isArray(acc2[columnName])) acc2[columnName] = [];
          // Same for rowName...
          
          acc2[columnName].push(slot)
          // same for others
          
          return acc2;
        }, acc)
      ,{})); // [ [true, false, true, false] ]
      

const isWinner = result /*[ttttf]*/ => result.reduce((cont, slot) => {
        if (cont.length >= 4) return cont;
        if (slot === false) return [];
        cont.push(slot);
        return cont;
    }, []).length >= 4;

const omg = aggregateBoard(board).some(isWinner);

/*

// You can use Mocha to execute tests in the following way:

const mocha = require('./useMocha');    // This import sets up mocha, don't remove it.
const assert = require("assert");
const sinon = require("sinon");
const expect = require("expect");

function foo(a, b) {
    return a + b;
}

describe("Component", function() {
    it("should add a + b", function() {
        assert(foo(2, 2) === 4, "2+2 is not equal to 4");
    });
});

mocha.run();    // This call runs the tests.

*/