Staircase

Consider a staircase of size n = 4:

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   #
  ##
 ###
####

Observe that its base and height are both equal to n, and the image is drawn using # symbols and spaces. The last line is not preceded by any spaces.

Write a program that prints a staircase of size n.

Function Description

Complete the staircase function in the editor below. It should print a staircase as described above.

staircase has the following parameter(s):

• n: an integer

Input Format

A single integer, n, denoting the size of the staircase.

Constraints

Output Format

Print a staircase of size using # symbols and spaces.

Note: The last line must have spaces in it.

Sample Input

1

6

Sample Output

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5
6

     #
    ##
   ###
  ####
 #####
######

Explanation

The staircase is right-aligned, composed of # symbols and spaces, and has a height and width of n = 6.

Solution

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function staircase(n) {
    let strings = Array(n).fill('#');

    return strings.reduceRight((target, string, index) => {
        target.push([...strings].join('').replace('#'.repeat(index), ' '.repeat(index)));

        return target
    }, []).join('\n');
}