Merge pull request LaunchCodeEducation#13 from LaunchCodeEducation/exporting-modules

Exporting modules

Author: jwoolbright23

modules/exercises/ScoreCalcs/averages.js

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+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

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+//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

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+//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

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+{
+  "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

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+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

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+// Import the modules exported from practiceExports.js below:

modules/exporting-modules/practiceExports.js

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+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];
+}