ARR PS - tree drawing

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function answer(height) {
    let result = [];
    let arr = new Array(height * 2 - 1).fill(" ");
    let mid = Math.floor(arr.length / 2);
    arr[Math.floor(arr.length / 2)] = "*";

    for (let i = 0; i < height; i++) {
        arr[mid - i] = "*";
        arr[mid + i] = "*";
        result.push(arr.join(""));
    }

    return result.join("\n");
}

let input = [3, 5, 7];

for (let i = 0; i < input.length; i++) {
    // process.stdout.write(`#${i + 1} `);
    console.log(answer(input[i]));
}