build-tower.md

Build Tower ^{6 Kyu}

^{LINK TO THE KATA - STRINGS ASCII ART FUNDAMENTALS}

Description

Build a pyramid-shaped tower, as an array/list of strings, given a positive integer number of floors. A tower block is represented with "*" character.

For example, a tower with 3 floors looks like this:

[
  "  *  ",
  " *** ",
  "*****"
]

And a tower with 6 floors looks like this:

[
  "     *     ",
  "    ***    ",
  "   *****   ",
  "  *******  ",
  " ********* ",
  "***********"
]

Solution

const towerBuilder = nFloors => {
  const piramidBase = nFloors * 2 - 1
  let floorsArray = []

  for (let i = 1; i < nFloors + 1; i++) {
    const currentFloorBase = i * 2 - 1
    const bricks = '*'.repeat(currentFloorBase)
    const spaceDifference = (piramidBase - currentFloorBase) / 2
    const blankSpace = ' '.repeat(spaceDifference)

    const floorBuilt = `${blankSpace}${bricks}${blankSpace}`

    floorsArray.push(floorBuilt)
  }

  return floorsArray
}