React-native-fs : How to use readDir recursively using .map()? - react-native

Question

I tried to get all the files and directories available in a folder using react-native-fs.
I created a function to get all the files and directories recursively in a folder, I call this function this way :
const data = await scanDir(path);
I first tried using the .map() function but my function return only some elements :
async function scanDir(pathOfDirToScan, data = {directory: [], files: []}) {
const readedFilesAndDir = await FS.readDir(pathOfDirToScan);
Object.keys(readedFilesAndDir).map(async key => {
if (readedFilesAndDir[key].isDirectory()) {
const directoryPath = pathOfDirToScan + '/' + readedFilesAndDir[key].name;
data.directory.push(directoryPath);
data = await scanDir(directoryPath, data);
} else {
data.files.push(pathOfDirToScan + '/' + readedFilesAndDir[key].name);
}
});
return data;
}
It seems my function return the data after the first time map is executed, but the function continue after that.
I then tried with a for loop and it works as intended :
async function scanDir(pathOfDirToScan, data = {directory: [], files: []}) {
const readedFilesAndDir = await FS.readDir(pathOfDirToScan);
for (let i = 0; i < readedFilesAndDir.length; i++) {
if (readedFilesAndDir[i].isDirectory()) {
const directoryPath = pathOfDirToScan + '/' + readedFilesAndDir[i].name;
data.directory.push(directoryPath);
data = await scanDir(directoryPath, data);
} else {
data.files.push(pathOfDirToScan + '/' + readedFilesAndDir[i].name);
}
}
return data;
}
What should I do to make the function properly works using .map() ?

Answer 1

The FS.readDir(dirpath) returns an array of objects as per docs. Object.keys(obj) is not required for iteration in that case, just readedFilesAndDir.map() will do your task.
Copy and pasted your own code with some corrections. Hope, it helps:
async function scanDir(pathOfDirToScan, data = {directory: [], files: []}) {
const readedFilesAndDir = await FS.readDir(pathOfDirToScan);
readedFilesAndDir.map(async eachItem=> {
if (eachItem.isDirectory()) {
const directoryPath = pathOfDirToScan + '/' + eachItem.name;
data.directory.push(directoryPath);
data = await scanDir(directoryPath, data);
} else {
data.files.push(pathOfDirToScan + '/' + eachItem.name);
}
});
return data;
}