Pascal triangle

pyramid.js

const pyramid = n => {
  const oddNumberArray = Array.from({ length: n * 2 })
    .map((v, i) => i + 1)
    .filter(v => {
      if (v % 2 !== 0) return v
    })
    let oddStringArray = numberToString(oddNumberArray)
    oddStringArray.map(v => console.log(pad(v, (n * 2) - 1)))
}

const pad = (str, length, char = ' ') => {
  return str.padStart((str.length + length) / 2, char)
    .padEnd(length, char)
}

const numberToString = (arr, char = '#') => {
  let str, result = [];
  arr.forEach(element => {
    for (let index = 1; index <= element; index++) 
      str = char.repeat(index)
    result.push(str)
  })
  return result
}

pyramid(10)