var generate = function(numRows) {
    var result = [];
    for (var i = 0; i < numRows; i++) {
        var row = [];
        for(var j = 0; j < i + 1; j++) {
            var val = 1;
            if(j !== 0 && j !== i){
                val = result[i - 1][j - 1] + result[i - 1][j];
            }
            row.push(val);
        }
        result.push(row);
    }
    return result;
};