Question

JavaScript Programming Assignment

PLEASE NOTE:  You must create and call a main function, and if instructed include additional functions called by the main. Make sure to use ES6 style of keywords => instead of the older function and for local scope variables use the keyword let and not a keyword var. Make sure to follow the requirements and recheck before submitting.

PROJECT GOAL:

Write a program that is required to use nested loops to generate a triangle as shown in the sample run below. The program should begin by prompting the user to enter the number of lines in the triangle and output to the console to match the example below.

Hint: Each line will contain either "O" or " " (spaces) to align the output to appear right justified and process.stdout.write will print without a newline.

How many lines of the triangle?:6

OOOOOO
OOOOO
OOOO
OOO
OO
O

Answer 1

// Javascript program to generate a triangle

let readline = require('readline-sync'); // module for taking input

var main = () =>{
  
   // input of the number of lines in the triangle
   num_lines = parseInt(readline.question("Enter number of lines in the triangle?: "));
  
   let i,j; // loop variables
  
   // nested loop to print the triangle
   for(i=num_lines;i>0;i--)
   {
       for(j=0;j<i;j++)
           process.stdout.write('O ');
       process.stdout.write('\n');  
   }
}

// call the main function
main()

//end of program

Output: