Evaluates position of board

chess-ai-position-evaluation.js

var evaluateBoard = function(board, color) {
  // Sets the value for each piece using standard piece value
  var pieceValue = {
    'p': 100,
    'n': 350,
    'b': 350,
    'r': 525,
    'q': 1000,
    'k': 10000
  };

  // Loop through all pieces on the board and sum up total
  var value = 0;
  board.forEach(function(row) {
    row.forEach(function(piece) {
      if (piece) {
        // Subtract piece value if it is opponent's piece
        value += pieceValue[piece['type']]
                 * (piece['color'] === color ? 1 : -1);
      }
    });
  });

  return value;
};