tree to array

function treeToArray(tree) {
    let result = [tree['value']];

    let pointer = 0;
    while (pointer < result.length) {
        if (result[pointer] !== null) {
            while (result[result.length - 1] === null) {
                result.pop()
            }
            let children = findNode(tree, result[pointer]);
            if(pointer>=result.length){
                break;
            }
            result.push(...children);
        }

        pointer++;
    }
    while (result[result.length - 1] === null) {
        result.pop()
    }
    console.log(result);
    return result
}

function findNode(root, target) {
    if (root.value === target) {
        return [root.left !== undefined ? root.left.value : null, root.right !== undefined ? root.right.value : null]
    } else {
        if (root.left !== undefined) {
            if (findNode(root.left, target) !== undefined) {
                return findNode(root.left, target);
            }
        }
        if (root.right !== undefined) {
            if (findNode(root.right, target) !== undefined) {
                return findNode(root.right, target);
            }
        }
    }
    return undefined;
}