"Project Completed"

emit.js

@@ -0,0 +1,39 @@
+let emitter = function() {
+  //I'm not even sure I need this.....
+  //or if this is within the 'events' module
+  this.evnts = {};
+
+  //attach an event listener with
+  this.on = (eventType, callback) => {
+    if (eventType) {
+      if (!Array.isArray(this.evnts[eventType])) {
+        this.evnts[eventType] = [];
+      }
+    }
+    this.evnts[eventType].push(callback);
+  };
+  //attach subsequent listeners with emitter.on
+
+  //Emit an event with
+  this.emit = eventType => this.evnts[eventType].forEach(val => val.call());
+  //This should result in all listeners attached
+  //to that event being invoked
+
+  //Remove a listener
+  this.removeListener = (eventType, callback) => {
+    this.evnts[eventType].forEach(val => {
+      if (val === callback) {
+        this.evnts[eventType].splice(val, 1);
+        console.log('Listener deleted');
+      }
+    });
+  };
+
+  //Remove all listeners on an event
+  this.removeAllListeners = eventType => {
+    delete this.evnts[eventType];
+    console.log('All listeners deleted');
+  };
+};
+
+module.exports = emitter;

fsp.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const fs = require('fs');
+
+let fsp = {};
+
+fsp.readFile = function(path) {
+  return new Promise(function(resolve, reject) {
+    fs.readFile(path, 'utf8', function(err, data) {
+      if (err) {
+        reject(err);
+      } else {
+        resolve(data);
+      }
+    });
+  });
+};
+
+fsp.writeFile = function(path, data) {
+  return new Promise(function(resolve, reject) {
+    fs.writeFile(path, data, function(err) {
+      if (err) {
+        reject(err);
+      } else {
+        resolve(data);
+      }
+    });
+  });
+};
+
+fsp.appendFile = function(path, data) {
+  return new Promise(function(resolve, reject) {
+    fs.appendFile(path, data, function(err) {
+      if (err) {
+        reject(err);
+      } else {
+        resolve(data);
+      }
+    });
+  });
+};
+
+module.exports = fsp;

index.js

@@ -0,0 +1,119 @@
+'use strict';
+const fs = require('fs');
+const fsp = require('./fsp.js');
+const Emitter = require('./emit.js');
+let emitter = new Emitter();
+const nativeEmitter = require('events');
+
+var hello = new Promise((resolve, reject) => {
+  setTimeout(resolve('Hello Promise!'), 1000);
+});
+
+hello.then(message => console.log(message)).catch(err => console.error(err));
+
+let delay = milliseconds => {
+  return new Promise(function(resolve, reject) {
+    setTimeout(() => {
+      if (milliseconds > 0) {
+        resolve(milliseconds);
+      } else {
+        reject('Done');
+      }
+    }, milliseconds);
+  });
+};
+
+let countDown = result => {
+  if (result > 0) {
+    console.log(result);
+    return (result -= 100);
+  } else {
+    console.log('Done!');
+  }
+};
+
+delay(1000)
+  .then(countDown) //=> 1000
+  .then(countDown) //=> 900
+  .then(countDown) //=> 800
+  .then(countDown) //=> 700
+  .then(countDown) //=> 600
+  .then(countDown) //=> 500
+  .then(countDown) //=> 400
+  .then(countDown) //=> 300
+  .then(countDown) //=> 200
+  .then(countDown) //=> 100
+  .then(countDown); //=> Done!
+
+let square = val => {
+  return new Promise((resolve, reject) => {
+    if (val !== undefined && typeof val === 'number') {
+      resolve(Math.pow(val, 2));
+    } else {
+      reject('No bueno');
+    }
+  });
+};
+
+let numArray = [1, 2, 3, 4, 5, 6, 7, 8, 9];
+
+numArray = numArray.map(square);
+
+Promise.all(numArray).then(val => console.log(val));
+
+let doBadThing = forRealz => {
+  return new Promise((resolve, reject) => {
+    if (forRealz) {
+      reject('Booo');
+    } else {
+      resolve('Yay');
+    }
+  });
+};
+
+doBadThing('jefe').then(
+  resolve => {
+    console.log(resolve);
+  },
+  reject => {
+    try {
+      throw reject;
+    } catch (err) {
+      console.error(err);
+    }
+  }
+);
+doBadThing(21)
+  .then(result => console.log('!!' + result))
+  .catch(err => console.error(err));
+
+fsp
+  .readFile('./lorem.txt')
+  .then(data => console.log(data))
+  .catch(err => console.error(err));
+
+fsp
+  .writeFile('./lorem.txt', 'Hello!')
+  .then(res => console.log(res))
+  .catch(err => console.error(err));
+
+fsp
+  .appendFile('./lorem.txt', 'Hello Again!')
+  .then(res => console.log(res))
+  .catch(err => console.error(err));
+
+let clocked = () => console.log('clocked');
+
+emitter.on('clock', clocked);
+
+emitter.on('clock', () => console.log('Its alive'));
+
+emitter.emit('clock');
+
+emitter.removeListener('clock', clocked);
+
+emitter.emit('clock');
+
+emitter.removeAllListeners('clock');
+
+console.log(emitter);

lorem.txt

@@ -0,0 +1 @@
+Hello!Hello Again!