function getSpiralMatrix (n) {

const matrix = []

for (let i = 0; i < n; ++i) { matrix.push([]) }

let counter = 1

let startRow = 0

let endRow = n - 1

let startCol = 0

let endCol = n - 1

while (startCol <= endCol && startRow <= endRow) {

for (let i = startCol; i <= endCol; ++i) {

matrix[startRow][i] = counter

counter++

}

startRow++

for (let i = startRow; i <= endRow; ++i) {

matrix[i][endCol] = counter

counter++

}

endCol--

for (let i = endCol; i >= startCol; --i) {

matrix[endRow][i] = counter

counter++

}

endRow--

for (let i = endRow; i >= startRow; --i) {

matrix[i][startCol] = counter

counter++

}

startCol++

}

return matrix

}

const matrix = getSpiralMatrix(3)

console.log(matrix)