Avonyel's Solution'

data/test.txt

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+Hello!Hello again!

index.js

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+const fsp = require("./lib/fsp")
+
+console.log(fsp);
+
+delay = function(milliseconds) {
+	var p = new Promise(function(resolve, reject) {	
+		setTimeout(function() {
+			resolve(milliseconds);
+		}, milliseconds)
+	});
+
+	return p;
+};
+
+countDown = function(milliseconds) {
+	if (milliseconds > 0) {
+		console.log(milliseconds);
+		milliseconds -=100;
+	} else {
+		console.log("Done!");
+	};
+
+	return delay(milliseconds);
+};
+
+delay(1000)
+	.then(countDown)
+	.then(countDown)
+	.then(countDown)
+	.then(countDown)
+	.then(countDown)
+	.then(countDown)
+	.then(countDown)
+	.then(countDown)
+	.then(countDown)
+	.then(countDown)
+	.then(countDown);
+
+var square = function(number) {
+	var p = new Promise(function (resolve, reject) {
+		if (typeof number === "number") {
+			var newNum = number * number;
+			resolve(newNum);
+		} else {
+			reject("Not a number");
+		}
+	});
+
+	return p;
+};
+
+var numArray = [1, 2, 3, 4, 5, 6, 7, 8, 9]
+
+numArray = numArray.map(function(num) {
+	return square(num);
+});
+
+Promise.all(numArray)
+	.then(function(number) {
+		console.log(number);
+	});
+
+doBadThing = function(forRealz) {
+	var p = new Promise(function(resolve, reject) {
+		if (!forRealz) {
+			resolve("Yay!");
+		} else {
+			reject("Oh noooooo!")
+		};
+	});
+
+	return p;
+};
+
+doBadThing(true)
+	.then(function(result) {
+		console.log(result);
+	})
+	.catch(function(err) {
+		console.error(err)
+	});
+
+doBadThing(false)
+	.then(function(result) {
+		throw "Whoops~!";
+		console.log(result);
+	})
+	.catch(function(err) {
+		console.error(err)
+	});
+
+fsp.readFile('./data/lorem.txt')
+  .then(function(data) {
+    // Outputs the file data
+    console.log(data);
+  })
+  .catch(function(err) {
+    console.error(err);
+  });
+
+fsp.writeFile('./data/test.txt', 'Hello!')
+  .then(function(res) {
+    // Outputs the file data
+    // after writing
+    console.log(res);
+  })
+  .catch(function(err) {
+    console.error(err);
+  });
+
+fsp.appendFile('./data/test.txt', 'Hello again!')
+  .then(function(res) {
+    // Outputs the file data
+    // after appending
+    console.log(res);
+  })
+  .catch(function(err) {
+    console.error(err);
+  });

lib/fsp.js

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+const fs = require("fs");
+
+const fsp = {
+	readFile: function(file) {
+		var p = new Promise(function(resolve, reject) {
+			fs.readFile(file, "utf8", function(err, data) {
+				if (err) {
+					reject(err);
+				} else {
+					resolve(data);
+				};
+			});
+		});
+
+		return p;
+	},
+
+	writeFile: function(file, text) {
+		var p = new Promise(function(resolve, reject) {
+			fs.writeFile(file, text, "utf8", function(err) {
+				if (err) {
+					reject(err);
+				}
+
+				resolve(fsp.readFile(file));
+			});
+		});
+
+		return p;
+	},
+
+	appendFile: function(file, text) {
+		var p = new Promise(function(resolve, reject) {
+			fs.appendFile(file, text, "utf8", function(err) {
+				if (err) {
+					reject(err);
+				}
+
+				resolve(fsp.readFile(file));
+			});
+		});
+
+		return p;
+	}
+};
+
+module.exports = fsp;

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/Avonyel/assignment_async_nodejs.git"
+  },
+  "author": "Stephanie Barker",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/Avonyel/assignment_async_nodejs/issues"
+  },
+  "homepage": "https://github.com/Avonyel/assignment_async_nodejs#readme"
+}