Inundação

inundacao.js

const matrix = [
[ 0,0,1,0,1],
[ 1,1,0,1,1],
[ 0,1,0,1,0 ],
[ 0,1,1,1,1 ],
[ 1,0,1,0,1 ],
]

function checkZero (index_x, index_y, check) {
  const temp = matrix[index_x] || []
  if (temp[index_y] === 0) {
    matrix[index_x][index_y] = check

    checkNeibors(index_x, index_y, check)
  }
}

function checkNeibors(index_row, index_column, randomString) {
  checkZero(index_row - 1, index_column + 1, randomString)
  checkZero(index_row, index_column + 1, randomString)
  checkZero(index_row + 1, index_column + 1, randomString)
  checkZero(index_row + 1, index_column, randomString)
  checkZero(index_row + 1, index_column - 1, randomString)
}

const LETTERS = ['A', 'E', 'I', 'O', 'U']

matrix.forEach((x) => {
 console.log(x)
})

matrix.forEach((row, index_row) => {
  row.forEach((element, index_column) => {
    if( element === 0 ) {
      const check = LETTERS.reverse().pop()

      matrix[index_row][index_column]  = check

      checkNeibors(index_row, index_column, check)
    }
  })
})

console.log('------------')

matrix.forEach((x) => {
 console.log(x)
})