first commit

Author: JMSLaw17

.gitignore

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+node_modules

README.md

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+## Setup
+npm install
+
+## Test
+npm test
+
+## Description
+This repo is designed to give students a better understanding of how to use callbacks to deal with async operations in Javascript. Complete each of the exercises in the exercises directory and test your code!

exercises/parse.js

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+const fs = require("fs");
+/* ASYNC-TEXT-PARSE 
+In this exercise, you need to utilize the provided functions as callbacks so that the
+tests pass. The input file contains space-separated numbers on multiple lines of a
+.txt file. Just by filling in the appropriate callbacks, you should be able to
+generate an output.txt file of booleans reflecting whether the sum of the numbers on
+a line add up to more or less than one hundred. You must also invoke the callback
+passed to initiateParse so that it runs after you have written your output file.
+
+EXAMPLE:
+
+input.txt
+50 43 10
+10 20 30
+50 40 0
+20 10 0
+20 40 30
+10 65 20
+43 60 20
+123 0 40
+122 44 0
+1 2 3
+
+output.txt
+true
+false
+false
+false
+false
+false
+true
+true
+true
+false
+
+/* ----------------------------  */
+
+// replace references to this function
+function PLACEHOLDER() {};
+
+// call the callback to initiateParse so that it only runs after parsing is complete
+function initiateParse(callback) {
+  fs.readFile(__dirname + '/../input.txt', 'utf8', PLACEHOLDER);
+
+  function writeOutput(err, data) {
+    let output = '';
+    for (let i = 0; i < data.length; i++) {
+      output += data[i];
+      if (i !== data.length - 1) {
+        output += '\n';
+      }
+    }
+
+    fs.writeFile(__dirname + '/../output.txt', output, function(err) {
+      if (err) throw err;
+    });
+  };
+
+  function calculateLines(data, cb) {
+    let filteredData = data.map(function(el) {
+      let values = el.split(' ');
+      let isGreaterThanHundred = false;
+      let runningTotal = 0;
+      for (let i = 0; i < values.length; i++) {
+        runningTotal += parseInt(values[i]);
+      }
+      if (runningTotal > 100) {
+        isGreaterThanHundred = true;
+      }
+      return isGreaterThanHundred;
+    });
+    setTimeout(function() {
+      cb(null, filteredData);
+    }, 100);
+  };
+
+  function splitLines(err, data) {
+    if (err) throw err;
+    let input = data.toString().split('\n');
+    calculateLines(input, PLACEHOLDER);
+  };
+
+}
+
+module.exports = initiateParse;

exercises/request.js

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+var fs = require('fs');
+var http = require('http');
+
+
+// The get request in this function retrieves data on Harry Potter characters from an API.
+// The parsedData received from this API will be an array containing character objects.
+// Each character object has several properties. The only properties relevant to us are
+// the 'house' property and the 'name' property. You should use fs.readFile to get the
+// name of a house from house.txt, and then construct an array containing the names of all
+// characters wtih a house property matching the house found in house.txt. Pass this array
+// into the getStudents callback to pass the tests.
+function getStudents(callback) {
+    http.get({
+        host: 'hp-api.herokuapp.com',
+        path: '/api/characters/students'
+    }, function(response) {
+        // Continuously update stream with data
+        var body = '';
+        response.on('data', function(d) {
+            body += d;
+        });
+        response.on('end', function() {
+            // Data reception is done, do whatever with it!
+            var parsedData = JSON.parse(body);
+            var pathToHouseFile = __dirname + '/../house.txt';
+            
+            // CODE HERE
+            // fs.readFile(pathToHouseFile, 'utf8'
+        });
+    });
+}
+
+module.exports = getStudents;

exercises/sentence.js

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+// DO NOT EDIT async function that gets the first word and passes it to its callback
+function getFirstWord(callback) {
+  setTimeout(function() {
+    callback('Async ');
+  }, 90);
+};
+
+// DO NOT EDIT async function that gets the second word and passes it to its callback
+function getSecondWord(callback) {
+  setTimeout(function() {
+    callback('is ');
+  }, 30);
+};
+
+// DO NOT EDIT async function that gets the third word and passes it to its callback
+function getThirdWord(callback) {
+  setTimeout(function() {
+    callback('awesome.');
+  }, 60);
+};
+
+// use the above functions to complete the sentence and pass it to this function's callback
+function getSentence(callback) {
+  // CODE HERE
+}
+
+module.exports = getSentence;

house.txt

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+Ravenclaw

input.txt

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+50 43 10
+10 20 30
+50 40 0
+20 10 0
+20 40 30
+10 65 20
+43 60 20
+123 0 40
+122 44 0
+1 2 3