Instructions

Write a function that accepts a positive number N. The function should console log a pyramid shape with N levels using the # character. Make sure the pyramid has spaces on both the left and right hand sides

// Examples
pyramid(1)
//       '#'
pyramid(2)
//       ' # '
//       '###'
pyramid(3)
//       '  #  '
//       ' ### '
//       '#####'

Solution - For loops

The trick with this one is to find the midpoint. To get the midpoint use Math.floor((2 *n -1)/ 2).

Firstly create a variable called 'midpoint' that stores the midpoint of our pyramid. Iterate through rows starting from 0. Create an empty string called 'level', then iterate through some columns starting with 0. The amount to iterate through is 2 * n -1. Now to check if the column should add '#' to level or a space to level. To know this, check if the midpoint - current row is less than or equal to current column AND midpoint + current row is greater than or equal to current column. If both are true add '#' to level, else add a space to level. Once the iteration through columns is complete log out the current level string.

Create a variable named midpoint that stores the midpoint of our pyramid

From 0 to n, iterate through rows

   Create an empty string 'level'

   From 0 to columns, iterate through rows

      IF the column should have

         add '#' to level

     ELSE

         add a space, to level

console log level

const pyramid = (n) => {
  const midpoint = Math.floor((2 * n - 1) / 2);

  for (let row = 0; row < n; row++) {
    let level = '';

    for (let column = 0; column < 2 * n - 1; column++) {
      if (midpoint - row <= column && midpoint + row >= column) {
        level += '#';
      } else {
        level += ' ';
      }
    }

    console.log(level);
  }
}

Solution - Recursion

Check if row is equal to n, if so we have hit the end of our problem and should return. Check if level length is equal to 2 * n -1. If true log the level and return the function with n and row +1. Else get the midpoint of n and create a variable called add. If the midpoint - current row is less than or equal to level length AND midpoint + row ≥ level length, add = '#'. Else add = space ' '. Return the function with n, row and level + add

Check if row === n

if level length === 2 * n - 1

   console log level

   return pyramid(n, row+1)

midpoint = Math.floor((2 * n - 1) / 2)

add variable add

if midpoint - row is less then or equal to level.length AND midpoint + row ≥ level.length

   add = #

else

   add = ' ' empty space

return pyramid with add variable added to string

const pyramid = (n, row = 0, level = '') => {
    // Check if row === n return is so
  if (row === n) {
    return
  }
    // Check level length
  if (level.length === 2 * n - 1) {
    console.log(level)
    return pyramid(n, row + 1)
  }
    // Get mid point
  const midpoint = Math.floor((2 * n - 1) / 2)
    // variable string to add to level
  let add
    // Check if we should add a # or space

  if (midpoint - row <= level.length && midpoint + row >= level.length) {
    add = '#'
  } else {
    add = ' '
  }
    // next call to pyramid
  pyramid(n, row, level + add)
}