Task 3

.gitignore

@@ -1 +1,2 @@
 /node_modules
+.vscode/

README.md

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 # node-mentoring-introduction
-Task 1
+Task 3
+https://d17btkcdsmqrmh.cloudfront.net/node-gmp/docs/event-emitter-vs-buffers-vs-streams/Homework
+
+## Subtask 1 
+Write your own EventEmitter class. 
+It must contain 
+- <code>on / addEventListener</code> method, 
+- <code>off / removeEventListener</code> method,
+- <code>once</code> method,
+- <code>emit</code> method,
+- <code>rawListeners</code> method,
+- <code>listenerCount</code> method.
+This basic features are sufficient to implement a full system using the eventing model.
+
+Test result: 
+
+<img width="683" alt="2023-09-14_22h43_54" src="https://github.com/kandalova/node-mentoring-introduction/assets/26093763/709017e9-e37b-4e71-9c24-22843d8c2c45">
+
+## Subtask 2
+Write a class <code>WithTime</code> which should extend your own class EventEmitter. 
+
+<code>WithTime</code> must execute some Async function with arguments and compute the time taken by this function.
+
+Execution must emit event start and end of execute and console.log of result data. This data must be gotten from Async function.
+
+Test result:
+
+![2023-09-15_20h27_13](https://github.com/kandalova/node-mentoring-introduction/assets/26093763/953a3aae-04fb-4f63-a231-b045a5febb96)
+
+## Subtask 3 
+
+Write a program which should do the following: 
+- Read the content of csvfile from./csvdirectory
+-  Use the csvtojson package to convert csvfile to json object
+-  Write the csvfile content to a new txtfile.
+-  Do not load all the content of the csvfile into RAM via stream (read/write file content line by line).
+-  In case of read/write errors, log them in the console.
+-  The program should be started via npm script using nodemon(i.e. npm run task2).
+
+Test result 
+
+Parsed csv strings
+
+<img width="402" alt="2023-09-15_22h50_54" src="https://github.com/kandalova/node-mentoring-introduction/assets/26093763/2f691522-66b0-48df-a240-474d546e53f7">
+
+Generated file 
+
+<img width="769" alt="2023-09-15_22h52_06" src="https://github.com/kandalova/node-mentoring-introduction/assets/26093763/addeb9fd-7123-4a3d-98da-2380a2679284">

csvdirectory/nodejs-hw1-ex1.csv

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+Book,Author,Amount,Price
+The Compound Effect,Darren Hardy,5,9.48
+The 7 Habits of Highly Effective People,Stephen R. Covey,4,23.48
+The Miracle Morning,Hal Elrod,10,21.34
+Influence: The Psychology of Persuasion,Robert B. Cialdini,4,12.99
+The ONE Thing,Gary Keller,1,11.18

index.js

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+import EventEmitter from "./utils/EventEmitter.js";
+
+const myEmitter = new EventEmitter();
+
+function c1() {
+    console.log('an event occurred!');
+}
+
+function c2() {
+    console.log('yet another event occurred!');
+}
+
+myEmitter.on('eventOne', c1); // Register for eventOne
+myEmitter.on('eventOne', c2); // Register for eventOne
+
+// Register eventOnce for one time execution
+myEmitter.once('eventOnce', () => console.log('eventOnce once fired'));
+myEmitter.once('init', () => console.log('init once fired'));
+
+// Register for 'status' event with parameters
+myEmitter.on('status', (code, msg)=> console.log(`Got ${code} and ${msg}`));
+
+
+myEmitter.emit('eventOne');
+
+// Emit 'eventOnce' -> After this the eventOnce will be
+// removed/unregistered automatically
+myEmitter.emit('eventOnce');
+
+
+myEmitter.emit('eventOne');
+myEmitter.emit('init');
+myEmitter.emit('init'); // Will not be fired
+myEmitter.emit('eventOne');
+myEmitter.emit('status', 200, 'ok');
+
+// Get listener's count
+console.log(myEmitter.listenerCount('eventOne'));
+
+// Get array of rawListeners//
+// Event registered with 'once()' will not be available here after the
+// emit has been called
+console.log(myEmitter.rawListeners('eventOne'));
+
+// Get listener's count after remove one or all listeners of 'eventOne'
+myEmitter.off('eventOne', c1);
+console.log(myEmitter.listenerCount('eventOne'));
+myEmitter.off('eventOne', c2);
+console.log(myEmitter.listenerCount('eventOne'));