Merge branch 'main' into ch-12-objects

Author: gildedgardenia

errors-and-debugging/exercises/DebuggingRuntimeErrors2.js

@@ -0,0 +1,21 @@
+let launchReady = false;
+let fuelLevel = 27000;
+
+if (fuelLevel >= 20000) {
+   console.log('Fuel level cleared.');
+   launchReady = true;
+} else {
+   console.log('WARNING: Insufficient fuel!');
+   launchReady = false;
+}
+
+if (launchReady) {
+   console.log("10, 9, 8...");
+   console.log("Fed parrot...");
+   console.log("6, 5, 4...");
+   console.log("Ignition...");
+   consoul.log("3, 2, 1...");
+   console.log("Liftoff!");
+} else {
+   console.log("Launch scrubbed.");
+}

exceptions/chapter-examples/finally/finally.js

@@ -0,0 +1,14 @@
+const input = require('readline-sync');
+
+let animals = [{name: 'cat'}, {name: 'dog'}];
+let index = Number(input.question("Enter index of animal:"));
+
+try {
+    console.log('animal at index:', animals[index].name);
+} catch(TypeError) {
+    console.log("We caught a TypeError, but our program continues to run!");
+} finally {
+    console.log("You tried to access an animal at index:", index);
+}
+
+console.log("the code goes on...");

exceptions/chapter-examples/finally/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "control-flow-type-error-finally",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "readline-sync": "^1.4.10"
+  }
+}

exceptions/chapter-examples/throw-default-error.js

@@ -0,0 +1 @@
+throw Error('You cannot divide by zero!');

exceptions/chapter-examples/try-catch/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "control-flow-type-error",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "readline-sync": "^1.4.10"
+  }
+}

exceptions/chapter-examples/try-catch/try-catch.js

@@ -0,0 +1,13 @@
+const input = require('readline-sync');
+
+let animals = [{name: 'cat'}, {name: 'dog'}];
+let index = Number(input.question("Enter index of animal:"));
+
+try {
+    console.log('animal at index:', animals[index].name);
+} catch(TypeError) {
+    console.log("We caught a TypeError, but our program continues to run!");
+    console.log("You tried to access an animal at index:", index);
+}
+
+console.log("the code goes on...");

exceptions/exercises/divide.js

@@ -0,0 +1,7 @@
+// Write a function called 'divide' that takes two parameters: a numerator and a denominator.
+
+// Your function should return the result of numerator / denominator.
+
+// However, if the denominator is zero you should throw the error, "Attempted to divide by zero."
+
+// Code your divide function here:

exceptions/exercises/test-student-labs.js

@@ -0,0 +1,24 @@
+function gradeLabs(labs) {
+  for (let i=0; i < labs.length; i++) {
+    let lab = labs[i];
+    let result = lab.runLab(3);
+    console.log(`${lab.student} code worked: ${result === 27}`);
+  }
+}
+
+let studentLabs = [
+  {
+    student: 'Carly',
+    runLab: function (num) {
+        return Math.pow(num, num);
+    }
+  },
+  {
+    student: 'Erica',
+    runLab: function (num) {
+        return num * num;
+    }
+  }
+];
+
+gradeLabs(studentLabs);

modules/exercises/ScoreCalcs/averages.js

@@ -0,0 +1,19 @@
+function averageForStudent(nameIndex,scores){
+  let sum = 0;
+  for (let i=0; i<scores.length; i++){
+    sum += scores[nameIndex][i];
+  }
+  let average = sum/scores[nameIndex].length;
+  return average;
+}
+
+function averageForTest(testIndex,scores){
+  let sum = 0;
+  for (let i=0; i<scores.length; i++){
+    sum += scores[i][testIndex];
+  }
+  let average = sum/scores[0].length;
+  return average;
+}
+
+//TODO: Export all functions within an object.

modules/exercises/display.js

@@ -0,0 +1,36 @@
+//TODO: Export ONLY the printAll function.
+
+function printAll(names, tests, scores){
+  let header = 'Name';
+  let row = '';
+
+  for (let i = 0; i<tests.length; i++){
+    header += '\t'+tests[i];
+  }
+  console.log(header);
+
+  for (let name = 0; name<names.length; name++){
+    row = names[name];
+    for (let score = 0; score<scores[name].length;score++){
+      row += '\t'+scores[name][score];
+    }
+    console.log(row);
+  }
+  return;
+}
+
+function printStudentScores(index,students,tests,scores){
+  console.log(`Test results for ${students[index]}:`);
+  for (let i = 0; i<tests.length; i++){
+    console.log(`${tests[i]} = ${scores[index][i]}%.`);
+  }
+  return;
+}
+
+function printTestScores(index,test,students,scores){
+  console.log(`Class results for ${test} test:`);
+  for (let i = 0; i<students.length; i++){
+    console.log(`${students[i]} = ${scores[i][index]}%.`);
+  }
+  return;
+}

modules/exercises/index.js

@@ -0,0 +1,39 @@
+//Import modules:
+const input = //Import readline-sync.
+const averages = //Import functions from averages.js.
+const printAll = //Import function from display.js.
+const randomSelect = //Import function from randomSelect.js.
+
+//Candidate data:
+let astronauts = ['Fox','Turtle','Cat','Hippo','Dog'];
+
+const testTitles = ['Math','Fitness','Coding','Nav','Communication'];
+
+let scores = [[95, 86, 83, 81, 76],[79, 71, 79, 87, 72],[94, 87, 87, 83, 82],[99, 77, 91, 79, 80],[96, 95, 99, 82, 70]];
+
+//User interface:
+let prompts = ['display all scores', 'average the scores for each test', 'average the scores for each astronaut','select the next spacewalker'];
+
+for (let i = 0; i<prompts.length; i++){
+  let response = input.question(`Would you like to ${prompts[i]}? Y/N: `);
+  if (response.toLowerCase()==='y'){
+    if (i===0){
+      //Call 'printAll' here and pass in all necessary arguments.
+    } else if (i===1){
+      for (let j = 0; j<testTitles.length; j++){
+        let avg = //Call 'averageForTest' here. Pass in j and scores as arguments.
+        console.log(`${testTitles[j]} test average = ${avg}%.`);
+      }
+    } else if (i===2){
+      for (let j = 0; j<astronauts.length; j++){
+        let avg = //Call 'averageForStudent' here. Pass in j and scores as arguments.
+        console.log(`${astronauts[j]}'s test average = ${avg}%.`);
+      }
+    } else {
+      let walker = //Call 'randomSelect' to pick a spacewalker from the astronauts array.
+      console.log(`${walker} is the next spacewalker.`);
+    }
+  } else {
+    console.log("Option skipped.");
+  }
+}

modules/exercises/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "Dependencies for Chapter 13 Exercises: Modules",
+  "version": "1.0.0",
+  "description": "This package.json file includes all dependencies needed to run code within files contained in this directory",
+  "main": "index.js",
+  "dependencies": {
+    "readline-sync": "^1.4.10"
+  },
+  "scripts": {
+    "start": "node index.js"
+  },
+  "author": "John Woolbright",
+  "license": "ISC"
+}

modules/exercises/randomSelect.js

@@ -0,0 +1,5 @@
+function randomFromArray(arr){
+  //Your code here to select a random element from the array passed to the function.
+}
+
+//TODO: Export the randomFromArray function.

modules/exporting-modules/index.js

@@ -0,0 +1 @@
+// Import the modules exported from practiceExports.js below:

modules/exporting-modules/practiceExports.js

@@ -0,0 +1,16 @@
+function isPalindrome(str){
+    return str === str.split('').reverse().join('');
+}
+
+function evenOrOdd(num){
+    if (num%2===0){
+        return "Even";
+    } else {
+        return "Odd";
+    }
+}
+
+function randomArrayElement(arr){
+    let index = Math.floor(Math.random()*arr.length);
+    return arr[index];
+}

more-on-functions/chapter-examples/anonymous-functions/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "Chapter 11: More on Functions Chapter Examples Directory",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "readline-sync": "^1.4.10"
+  }
+}

more-on-functions/chapter-examples/anonymous-functions/refactor-to-anonymous.js

@@ -0,0 +1,7 @@
+function reverse(str) {
+  let lettersArray = str.split('');
+  let reversedLettersArray = lettersArray.reverse();
+  return reversedLettersArray.join('');
+}
+
+console.log(reverse("LaunchCode"));

more-on-functions/chapter-examples/anonymous-functions/userInput-is-negative.js

@@ -0,0 +1,10 @@
+const input = require('readline-sync');
+let userInput = input.question("Please enter a number:");
+let logger = function(errorMsg) {
+  console.log("ERROR: " + errorMsg);
+};
+if (userInput < 0) {
+  // ______("Invalid input");
+}
+
+// Fill in the blank in line 7 (then uncomment it) so that it logs an error message if userInput is negative.

more-on-functions/chapter-examples/make-function-call-itself/decreasingSum.js

@@ -0,0 +1,9 @@
+function decreasingSum(integer) {
+   if (integer === 1){
+      return integer;
+   } else {
+      //call decreasingSum function again
+   }
+}
+
+console.log(decreasingSum(5));

more-on-functions/chapter-examples/make-function-call-itself/function-calls-itself.js

@@ -0,0 +1,16 @@
+function combineEntries(arrayName) {
+  if (arrayName.length <= 1){
+    return arrayName[0];
+  } else {
+    //console.log(arrayName[0], arrayName.slice(1));
+    return arrayName[0] + combineEntries(arrayName.slice(1));
+  }
+}
+
+//First, run the code to see the result.
+
+//Next, uncomment the console.log statement above to see how each call to combineEntries looks at a different section of the original array.
+
+let arr = ['L', 'C', '1', '0', '1'];
+
+console.log(combineEntries(arr));

more-on-functions/chapter-examples/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "Chapter 11: More on Functions Chapter Examples Directory",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "readline-sync": "^1.4.10"
+  }
+}

more-on-functions/chapter-examples/passing-functions-as-arguments/delayed-message.js

@@ -0,0 +1,5 @@
+function printMessage() {
+    console.log("The future is now!");
+}
+
+setTimeout(printMessage, 5000);

more-on-functions/chapter-examples/passing-functions-as-arguments/halve-each-number.js

@@ -0,0 +1,7 @@
+let nums = [3.14, 42, 4811];
+
+// TODO: Write a mapping function
+// and pass it to .map()
+let halved = nums.map();
+
+console.log(halved);

more-on-functions/chapter-examples/passing-functions-as-arguments/map-array-of-strings.js

@@ -0,0 +1,7 @@
+let names = ["Chris", "Jim", "Sally", "Blake", "Paul", "John", "Courtney", "Carly"];
+
+// TODO: Write a mapping function
+// and pass it to .map()
+let firstInitials = names.map();
+
+console.log(firstInitials);

more-on-functions/chapter-examples/passing-functions-as-arguments/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "Chapter 11: More on Functions Chapter Examples Directory",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "readline-sync": "^1.4.10"
+  }
+}

more-on-functions/chapter-examples/receieve-function-arguments/function-type-error.js

@@ -0,0 +1,5 @@
+function callMe(func) {
+    func();
+}
+
+callMe("Al");

more-on-functions/chapter-examples/receieve-function-arguments/getValidInput.js

@@ -0,0 +1,21 @@
+const input = require('readline-sync');
+
+function getValidInput(prompt, isValid) {
+    
+    let userInput = input.question(prompt);
+
+    while (!isValid(userInput)) {
+      console.log("Invalid input. Try again.");
+      userInput = input.question(prompt);
+    }
+
+    return userInput;
+}
+
+// TODO 1: write a validator 
+// that ensures input starts with "a"
+
+// TODO 2: write a validator 
+// that ensures input is a vowel
+
+// Be sure to test your code!