pascalstriangle.js

// if numRows is > 2: initialize an array that will hold our pascals triangle with [[1], [1, 1]]
// generate a loop based on the numRows input and start at i = 2 and initialize a new row
    // inside each iteration, produce an inner loop of j that will help produce the current row
        // reach into our pascals triangle array, sum up the appropriate values, and push to our row
    // finish by pushing a final 1 to the current row and then pushing that row to our pascals triangle array
// return our pascals array 

var generate = function(numRows) {
    
    if (numRows === 0) {
        return [];
    }
      
    if (numRows === 1) {
        return [[1]];
    }
    
    let pascals = [[1], [1, 1]];
    
    for (let i = 2; i < numRows; i++) {
        let row = [];
        row.push(1);
        for (let j=0; j < pascals[i-2].length; j++) {
            row.push(pascals[i-1][j] + pascals[i-1][j+1]);
        }
        row.push(1);
        pascals.push(row);
    }
    
    return pascals

};