rrmhearts

const idMapping = data.reduce((acc, el, i) => {
    acc[el.id] = i;
    return acc;
}, {});

let root = [];
data.forEach(el => {
    // Handle the root element
    if (el.parent === null) {
        root.push(el);

rrmhearts

// nestedTree is a tree structure containing subtrees under "nodes" property. d=1 is the default "depth of the tree"
function flatDeep(arr, d = 1) {
    return d > 0 ? arr.reduce((acc, val) => acc.concat(Array.isArray(val.nodes) ? flatDeep(val.nodes, d - 1) : val), [])
                 : arr.slice();
 };

let flat = flatDeep(nestedTree, Infinity);
// Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat

rrmhearts

# --rbind mounts subdirectories that are required.
sudo mount /dev/sda3 /mnt/
sudo mount --rbind /proc/ /mnt/proc/
sudo mount --bind /sys/ /mnt/sys/
sudo mount --rbind /dev/ /mnt/dev/
sudo chroot /mnt/

# Repair grub in /etc/default/grub