Check for consecutive matches in multidimensional array in both rows and columns. Return the index of each match. Candy Crush style matching.

candy-crush-match.js

var grid = 
[
    ['a', 'b', 'c', 'c', 'c', 'c', 'c', 'd'],
    ['a', 'c', 'a', 'c', 'a', 'a', 'b', 'a'],
    ['b', 'a', 'c', 'a', 'b', 'a', 'b', 'b'],
    ['a', 'a', 'a', 'b', 'a', 'd', 'b', 'b'],
    ['a', 'b', 'c', 'a', 'a', 'a', 'e', 'b'],
    ['a', 'b', 'c', 'a', 'a', 'a', 'b', 'b'],
    ['a', 'b', 'c', 'a', 'a', 'c', 'b', 'b'],
    ['a', 'c', 'a', 'c', 'a', 'd', 'b', 'b'],
]

findMatchesRow = function(grid) {
    var gridSize = grid.length
    var matches = [];
    var rowMatch = [];
    var columnMatch = [];

    for (var i = 0; i < gridSize; i++) {
        var oneBeforeRow = null;
        var oneBeforeColumn = null;
        var currentRow = null;
        var currentColumn = null;
        
        for (var t = 0; t < gridSize; t++) {
            
            currentRow = grid[i][t];
            currentColumn = grid[t][i];
            
            if (currentRow === oneBeforeRow) {    
              rowMatch.push({x:t, y:i});
            }
            else {
                if(rowMatch.length > 2) {
                    matches.push(rowMatch);
                }
                rowMatch = [];
                rowMatch.push({x:t, y:i});
            }
            
            oneBeforeRow = currentRow
            
            if (currentColumn === oneBeforeColumn) {
              columnMatch.push({x:i, y:t});
            }
            else {
                if(columnMatch.length > 2) {
                    matches.push(columnMatch);
                }
                columnMatch = [];
                columnMatch.push({x:i, y:t});
            }
            oneBeforeColumn = currentColumn;
           
        }
             
    }
    return matches;
}


findMatchesRow(grid);