As the title describes, I would like to read all files from a specific directory and return the names of all the files that have a specific string in its contents.
Here is how my code looks so far:
const dirname = path.resolve("./results/");
async function readFiles(dirname) {
const allResults = []
fs.readdir(dirname, function(err, filenames) {
if (err) {
console.log(err);
return;
}
filenames.forEach(async function(filename) {
fs.readFile(dirname + "/" + filename, 'utf-8', function(err, content) {
if (err) {
console.log(err);
return;
}
if (content.includes('content string')) {
allResults.push(filename);
}
});
});
});
return allResults;
}
readFiles(dirname).then((res) => {
console.log(res);
})The result I'm getting is []
so I understand it's an issue with promises and async functions, however, this is not a concept I fully grasp yet, and despite trying several combinations of possibilities (new Promise(), or .then, await, or readdirSync and readFileSync) I had no success.
What am I missing so that it returns the allResults array only once all files have been read?
You should ditch callback syntax and use fs.promises Api. This looks much cleaner
const fs = require("fs").promises;
const path = require("path");
const dirname = path.resolve("./results/");
async function readDir(dirname) {
const allResults = [];
try {
const files = await fs.readdir(dirname);
for (const fileName of files) {
try {
const content = await fs.readFile(`${dirname}/${fileName}`, {
encoding: "utf-8"
});
if (content.includes("content string")) {
allResults.push(fileName);
}
} catch (error) {
console.log(error.message);
}
}
return allResults;
} catch (error) {
console.log(error);
}
}
readDir(dirname).then(data => {
console.log(data);
});