equalPairs

function myFunc(matrix) {

    let pairs = 0

    for (let r = 0; r < matrix.length; r++) {
        for (let c = 0; c < matrix[r].length; c++) {
            if (c + 1 < matrix[r].length) {
                if (matrix[r][c] === matrix[r][c + 1]) { pairs++ }
            }
            if (r + 1 < matrix.length) {
                if (matrix[r][c] === matrix[r + 1][c]) { pairs++ }
            }
        }


    }


    return pairs
}



console.log(myFunc([['test', 'yes', 'yo', 'ho'],
['well', 'done', 'yo', '6'],
['not', 'done', 'yet', '5']]
))