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const data = require('./data')
const startArray = [data.split(/\n/g).filter(e => e).map(e => e.split(''))]
const cycle = (arr) => {
const l = arr[0].length
const empty = Array(l+2).fill(Array(l+2).fill('.'))
const empty2 = Array(l+2).fill('.')
const addDots = ars => ars.map(ar => ([empty2, ...(ar.map(a => ['.', ...a, '.'])), empty2]))
const resized = [empty, ...addDots(arr), empty]
const around = (iz, iy, ix) => {
const f = (rz, ry, rx) => {
if (
!resized[iz+rz]
|| !resized[iz+rz][iy+ry]
|| !resized[iz+rz][iy+ry][ix+rx]
) { return 0 }
return resized[iz+rz][iy+ry][ix+rx] === '#' ? 1 : 0
}
let c = 0
for (let z=-1; z<=1; z++) {
for (let y=-1; y<=1; y++) {
for (let x=-1; x<=1; x++) {
if(!(x == 0 && y == 0 && z == 0)) { c += f(z, y, x) }
}
}
}
return c
}
return resized.map((z, iz) => z.map((y,iy) => y.map((x,ix) => {
const active = x === '#'
const activeAround = around(iz,iy,ix)
if (active) {
return (activeAround === 2 || activeAround === 3) ? '#' : '.'
} else {
return (activeAround === 3) ? '#' : '.'
}
})))
}
let cycleResult = startArray, round = 1
while (round <= 6) {
cycleResult = cycle(cycleResult)
round++
}
let result = 0
cycleResult.forEach(z => z.forEach(y => y.forEach(x => {
if (x === '#') {result++}
})))
console.log('Answer: ', result)
|
