Pascal Solution (iterative)

gistfile1.txt

/**
 * @param {number} numRows
 * @return {number[][]}
 */
var generate = function(numRows) {
    var result = [];
        result[0] = [1];
        result[1] = [1,1];
    for (var row = 2; row < n; row++){
        result[row] = [1];
        for (var col = 1; col <= row -1; col++){
            result[row][col] = result[row-1][col] + result[row-1][col-1];
            result[row].push(1);
        }
    }
    return result;
};