PascalTriangle.js

// Prints a Pascal Triangle of 'n' no. of lines
function PascalTriangle(n) {
    var arr = [];
    for (var i = 0; i < n; i++) {
        // Create an array
        arr[i] = [];

        // Mark 1st and last element as 1
        arr[i][0] = 1;
        arr[i][i] = 1;

        // Add numbers of above elements to find value of current element
        if (i > 0) {
            for (var j = 1; j < i; j++) {
                arr[i][j] = arr[i - 1][j - 1] + arr[i - 1][j];
            }
        }

        // Add'em all up in a string variable after adding up the necessary spaces
        var printStr = '';
        for (var j = 0; j < n - i; j++) {
            printStr += ' ';
        }
        printStr += arr[i].join(' ');
        console.log(printStr);
    }
}