finish exercises

data/dummy.txt

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+This is a dummy file.
+Do re mi fa so la ti do.
+Father
+Keep me in mind for that one thing. I haven't forgotten. I don't to spend a lot of money. Coffee is pretty acidic.

data/test.txt

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+Help, I'm trapped in a test file!
+Hello again!

index.js

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+var fsp = require('./node_modules/fsp.js');
+var fs= require('fs');
+//var Emitter = require('./node_modules/emitter.js');
+var Emitter = require('events');
+var emitter = new Emitter();
+
+var p =new Promise(function(resolve, reject){
+  setTimeout(function(){resolve('Hello Promise!')}, 1000);
+});
+
+p.then(function(message, err){
+  console.log(message);
+}).catch(function(error){
+  console.log(error);
+});
+
+function delay(milliseconds){
+
+  let prom = new Promise(function(resolve, reject){
+    setTimeout(function(){resolve(milliseconds)}, milliseconds);
+  })
+
+  return prom;
+}
+
+function countDown(number){
+  if (number>0){
+    console.log(number);
+    number-=100;
+  }
+  else{
+    console.log("Done!");
+    return undefined;
+  }
+  return delay(number);
+};
+
+delay(1000)
+  .then(countDown)
+  .then(countDown)
+  .then(countDown)
+  .then(countDown)
+  .then(countDown)
+  .then(countDown)
+  .then(countDown)
+  .then(countDown)
+  .then(countDown)
+  .then(countDown);
+
+
+function squarePromise(number){
+  let prom = new Promise(function(resolve, reject){
+    if (typeof number !=="number"){
+      reject("Rejected!");
+    }
+    else
+      resolve(number*number);
+  })
+  return prom;
+}
+
+num_array=[1,2,3,4,5,6,7,8,9];
+
+num_array=num_array.map(i => {return squarePromise(i)});
+
+Promise.all(num_array).then(function(result){
+  console.log(result);
+});
+
+
+function doBadThing(forRealz){
+  let prom = new Promise(function(resolve, reject){
+    if (!forRealz){
+      resolve('Yay!');
+    }
+    else{
+      reject('Rejected!');
+    }
+  });
+  return prom;
+}
+
+doBadThing(true).then(function(result){
+  console.log(result);
+}, function(reject){
+  console.log("This was given a rejection handler");
+})
+
+doBadThing(0).then(function(result){
+  console.log(result);
+})
+  .catch(error =>{
+    console.log(error);
+  });
+
+fsp.readFile('./data/dummy.txt')
+  .then(function(data){
+    console.log(data);
+  })
+  .catch(function(err){
+    console.log(err);
+  });
+
+fsp.writeFile('./data/test.txt', "Help, I'm trapped in a test file!")
+  .then(function(res) {
+    // Outputs the file data
+    // after writing
+    console.log(res);
+  })
+  .catch(function(err) {
+    console.error(err);
+  });
+
+fsp.appendFile('./data/test.txt', '\nHello again!')
+  .then(function(res) {
+    // Outputs the file data
+    // after appending
+    console.log(res);
+  })
+  .catch(function(err) {
+    console.error(err);
+  });
+
+function firstFunc(){
+  console.log("this emitter");
+};
+emitter.on("first", function(){
+  console.log("this emitter");
+});
+
+emitter.on("second", function(){
+  console.log("is");
+});
+emitter.on("second", function(){
+  console.log("always going to be");
+});
+
+emitter.on("third", function(){
+  console.log("totally working");
+});
+
+
+emitter.emit("first");
+emitter.emit("second");
+emitter.emit("third");
+
+var tf=emitter.removeListener("first", firstFunc);
+console.log("tf is " +tf);
+emitter.emit("first");
+
+emitter.on("first", firstFunc);
+emitter.removeAllListeners("second");
+emitter.emit("first");
+emitter.emit("second");
+emitter.emit("third");

package.json

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+{
+  "name": "assignment_async_nodejs",
+  "version": "1.0.0",
+  "description": "Async Node.js sprint",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/SamuelLangenfeld/assignment_async_nodejs.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/SamuelLangenfeld/assignment_async_nodejs/issues"
+  },
+  "homepage": "https://github.com/SamuelLangenfeld/assignment_async_nodejs#readme"
+}