I have some problems with serialise data.
I have array of objects like this (pseudo-files):
const files = [
{
id: 'ruslan/cache/vars.json',
size: 17
},
{
id: 'cache/vars.json.bak',
size: 17
},
{
id: 'wcc-config.json',
size: 10
}];
How i can convert without recursion this to tree with folders and files inside like:
rootFolder = {
files: [{
name: 'wcc-config.json',
size: 10
}],
folders: [{
name: 'cache',
files: [{
name: 'vars.json.bak',
size: 17
}],
folders: []
}, {
name: 'ruslan',
files: [],
folders: [{
name: 'cache',
files: [{
name: 'vars.json',
size: 17
}],
folders: []
}]
}]
}
Here is a non-recursive function. It uses a helper object mapper which keeps track of the created objects by their path (as key). This is needed to find the parent of a new node, so we can insert that node in the files or folders property of that parent.
The code:
function makeTree(files) {
const mapper = {};
for (const {id, size} of files) {
let node, parent = "";
let i = 0, j = 0;
while (j > -1) {
let path = id.slice(0, j);
if (!mapper[path]) {
node = {
name: id.slice(i, j),
files: [],
folders: [],
};
mapper[path] = node;
if (path) mapper[parent].folders.push(node);
}
parent = path;
i = j + !!i;
j = id.indexOf("/", i);
}
node = {
name: id.slice(i),
size
};
mapper[id] = node;
mapper[parent].files.push(node);
}
return mapper[""];
}
// Example run
const files = [{ id: 'ruslan/cache/vars.json', size: 17 },{ id: 'cache/vars.json.bak', size: 17 },{ id: 'wcc-config.json',size: 10}];
console.log(makeTree(files));