Traverse a 2d array in single for-loop

2DArraySingleForLoop.js

function traverse (values, numCols) {
    var numRows = values.length / numCols;
    for (var i = 0, length = values.length; i < length; i++) {
        var row = (i % length / numCols) << 0; // = Math.floor
        var col = i % numCols;
        console.log(i, row, col);
    }
}