feat: done tasks

src/cli/args.js

@@ -1,5 +1,18 @@
-const parseArgs = () => {
-  // Write your code here
-};
-
-parseArgs();
+const parseArgs = () => {
+  let arg = process.argv;
+  const getArg = arg.reduce((acc, current, index) => {
+    if (current.startsWith("--")) {
+      const val = current.substring(2);
+      const next = arg[index + 1];
+      if (next) {
+        const formattedPair = `${val} is ${next}`;
+        return acc + (acc.length ? ", " : "") + formattedPair;
+      }
+    }
+    return acc;
+  }, "");
+
+  console.log(getArg);
+};
+
+parseArgs();

src/cli/env.js

@@ -1,5 +1,13 @@
-const parseEnv = () => {
-  // Write your code here
-};
-
-parseEnv();
+const parseEnv = () => {
+  let env = process.env;
+  let selectRss = Object.entries(env)
+    .filter(([key]) => key.startsWith("RSS_"))
+    .map(([key, value], index) => {
+      return `${key}=${value}`;
+    });
+  let result = selectRss.join("; ");
+
+  console.log(result);
+};
+
+parseEnv();

src/cp/cp.js

@@ -1,6 +1,6 @@
-const spawnChildProcess = async (args) => {
-  // Write your code here
-};
-
-// Put your arguments in function call to test this functionality
-spawnChildProcess( /* [someArgument1, someArgument2, ...] */);
+const spawnChildProcess = async (args) => {
+  // Write your code here
+};
+
+// Put your arguments in function call to test this functionality
+spawnChildProcess( /* [someArgument1, someArgument2, ...] */);

src/cp/files/script.js

@@ -1,19 +1,19 @@
-import { EOL } from 'node:os';
-import { argv, stdout, stdin, exit } from 'node:process';
-
-const args = argv.slice(2);
-
-console.log(`Total number of arguments is ${args.length}`);
-console.log(`Arguments: ${JSON.stringify(args)}${EOL}`);
-
-const echoInput = (chunk) => {
-  const chunkStringified = chunk.toString();
-
-  if (chunkStringified.includes('CLOSE')) {
-    exit(0);
-  }
-
-  stdout.write(`Received from master process: ${chunk.toString()}${EOL}`);
-};
-
-stdin.on('data', echoInput);
+import { EOL } from 'node:os';
+import { argv, stdout, stdin, exit } from 'node:process';
+
+const args = argv.slice(2);
+
+console.log(`Total number of arguments is ${args.length}`);
+console.log(`Arguments: ${JSON.stringify(args)}${EOL}`);
+
+const echoInput = (chunk) => {
+  const chunkStringified = chunk.toString();
+
+  if (chunkStringified.includes('CLOSE')) {
+    exit(0);
+  }
+
+  stdout.write(`Received from master process: ${chunk.toString()}${EOL}`);
+};
+
+stdin.on('data', echoInput);

src/fs/copy.js

@@ -1,5 +1,34 @@
-const copy = async () => {
-  // Write your code here
-};
-
-await copy();
+import fs from "fs/promises";
+import path from "path";
+
+const copy = async () => {
+  let folderFiles = path.join(import.meta.dirname, "files");
+  let folderFilesCopy = path.join(import.meta.dirname, "files_copy");
+  let errorText = "FS operation failed";
+
+  try {
+    //create promise to check if folders exist
+    let results = await Promise.allSettled([
+      fs.access(folderFiles, fs.constants.F_OK),
+      fs.access(folderFilesCopy, fs.constants.F_OK),
+    ]);
+    //save exist check results
+    let isFolderFiles = results[0].status === "fulfilled";
+    let isfolderFilesCopy = results[1].status === "rejected";
+
+    //copy to new folder if conditions true
+    if (isFolderFiles && isfolderFilesCopy) {
+      try {
+        await fs.cp(folderFiles, folderFilesCopy, { recursive: true });
+      } catch (err) {
+        throw new Error(errorText);
+      }
+    } else {
+      throw new Error(errorText);
+    }
+  } catch (error) {
+    throw new Error(errorText);
+  }
+};
+
+await copy();

src/fs/create.js

@@ -1,5 +1,16 @@
-const create = async () => {
-  // Write your code here
-};
-
-await create();
+import fs from "fs/promises";
+import path from "path";
+
+const create = async () => {
+  let pathFolder = path.join(import.meta.dirname, "files", "fresh.txt");
+  let fileText = "I am fresh and young";
+  let errorText = "FS operation failed";
+
+  try {
+    await fs.writeFile(pathFolder, fileText, { flag: "wx" });
+  } catch (error) {
+    throw new Error(errorText);
+  }
+};
+
+await create();

src/fs/delete.js

@@ -1,5 +1,15 @@
-const remove = async () => {
-  // Write your code here
-};
-
-await remove();
+import fs from "fs/promises";
+import path from "path";
+
+const remove = async () => {
+  let removeFile = path.join(import.meta.dirname, "files", "fileToRemove.txt");
+  let errorText = "FS operation failed";
+
+  try {
+    await fs.rm(removeFile);
+  } catch (error) {
+    throw new Error(errorText);
+  }
+};
+
+await remove();

src/fs/files/fileToRead.txt

@@ -1,7 +1,7 @@
-My content
-should
-be
-printed
-into
-console
+My content
+should
+be
+printed
+into
+console
 !

src/fs/files/wrongFilename.txt

@@ -1,3 +1,3 @@
-# This is a file with a wrong filename
-
+# This is a file with a wrong filename
+
 Hello from **markdown**!

src/fs/list.js

@@ -1,5 +1,16 @@
-const list = async () => {
-  // Write your code here
-};
-
-await list();
+import fs from "fs/promises";
+import path from "path";
+
+const list = async () => {
+  let folderPath = path.join(import.meta.dirname, "files");
+  let errorText = "FS operation failed";
+
+  try {
+    let data = await fs.readdir(folderPath);
+    console.log(data);
+  } catch (error) {
+    throw new Error(errorText);
+  }
+};
+
+await list();

src/fs/read.js

@@ -1,5 +1,16 @@
-const read = async () => {
-  // Write your code here
-};
-
-await read();
+import fs from "fs/promises";
+import path from "path";
+
+const read = async () => {
+  let filePath = path.join(import.meta.dirname, "files", "fileToRead.txt");
+  let errorText = "FS operation failed";
+
+  try {
+    let data = await fs.readFile(filePath, "utf8");
+    console.log(data);
+  } catch (error) {
+    throw new Error(errorText);
+  }
+};
+
+await read();

src/fs/rename.js

@@ -1,5 +1,31 @@
-const rename = async () => {
-  // Write your code here
-};
-
-await rename();
+import fs from "fs/promises";
+import path from "path";
+
+const rename = async () => {
+  let oldFile = path.join(import.meta.dirname, "files", "wrongFilename.txt");
+  let newFile = path.join(import.meta.dirname, "files", "properFilename.md");
+  let errorText = "FS operation failed";
+
+  try {
+    let results = await Promise.allSettled([
+      fs.access(oldFile, fs.constants.F_OK),
+      fs.access(newFile, fs.constants.F_OK),
+    ]);
+    let isOldFiles = results[0].status === "fulfilled";
+    let isNewFiles = results[1].status === "rejected";
+
+    if (isOldFiles && isNewFiles) {
+      try {
+        await fs.rename(oldFile, newFile);
+      } catch (err) {
+        throw new Error(errorText);
+      }
+    } else {
+      throw new Error(errorText);
+    }
+  } catch (error) {
+    throw new Error(errorText);
+  }
+};
+
+await rename();

src/hash/calcHash.js

@@ -1,5 +1,26 @@
-const calculateHash = async () => {
-  // Write your code here
-};
-
-await calculateHash();
+import { createHash } from "crypto";
+import { createReadStream } from "fs";
+import { pipeline } from "stream/promises";
+import path from "path";
+
+const calculateHash = async () => {
+  const hashFile = path.join(
+    import.meta.dirname,
+    "files",
+    "fileToCalculateHashFor.txt"
+  );
+
+  const hash = createHash("sha256");
+  const stream = createReadStream(hashFile);
+
+  try {
+    await pipeline(stream, hash);
+    const hexHash = hash.digest("hex");
+    console.log(hexHash);
+    return hexHash;
+  } catch (error) {
+    throw new Error(error);
+  }
+};
+
+await calculateHash();

src/modules/esm.mjs

@@ -0,0 +1,45 @@
+import path from "path";
+import { release, version } from "os";
+import { createServer as createServerHttp } from "http";
+import "./files/c.cjs";
+
+const random = Math.random();
+let unknownObject;
+if (random > 0.5) {
+  unknownObject = (
+    await import("./files/a.json", {
+      with: { type: "json" },
+    })
+  ).default;
+} else {
+  unknownObject = (
+    await import("./files/b.json", {
+      with: { type: "json" },
+    })
+  ).default;
+}
+
+console.log(`Release ${release()}`);
+console.log(`Version ${version()}`);
+console.log(`Path segment separator is "${path.sep}"`);
+
+console.log(`Path to current file is ${import.meta.filename}`);
+console.log(`Path to current directory is ${import.meta.dirname}`);
+
+const myServer = createServerHttp((_, res) => {
+  res.end("Request accepted");
+});
+
+const PORT = 3000;
+
+console.log(unknownObject);
+
+myServer.listen(PORT, () => {
+  console.log(`Server is listening on port ${PORT}`);
+  console.log("To terminate it, use Ctrl+C combination");
+});
+
+export default {
+  unknownObject,
+  myServer,
+};

src/modules/files/a.json

@@ -1,5 +1,5 @@
-{
-  "a": 1,
-  "b": 2,
-  "c": 3
-}
+{
+  "a": 1,
+  "b": 2,
+  "c": 3
+}

src/modules/files/b.json

@@ -1,5 +1,5 @@
-{
-  "a": 11,
-  "b": 22,
-  "c": 33
-}
+{
+  "a": 11,
+  "b": 22,
+  "c": 33
+}

src/modules/files/c.cjs

@@ -1 +1 @@
-console.log('Hello from c.cjs!');
+console.log('Hello from c.cjs!');

src/streams/files/fileToWrite.txt

@@ -0,0 +1 @@
+