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LS Practice Problem: Class Records Summary
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| var studentScores = { | |
| student1: { | |
| id: 123456789, | |
| scores: { | |
| exams: [90, 95, 100, 80], | |
| exercises: [20, 15, 10, 19, 15], | |
| }, | |
| }, | |
| student2: { | |
| id: 123456799, | |
| scores: { | |
| exams: [50, 70, 90, 100], | |
| exercises: [0, 15, 20, 15, 15], | |
| }, | |
| }, | |
| student3: { | |
| id: 123457789, | |
| scores: { | |
| exams: [88, 87, 88, 89], | |
| exercises: [10, 20, 10, 19, 18], | |
| }, | |
| }, | |
| student4: { | |
| id: 112233445, | |
| scores: { | |
| exams: [100, 100, 100, 100], | |
| exercises: [10, 15, 10, 10, 15], | |
| }, | |
| }, | |
| student5: { | |
| id: 112233446, | |
| scores: { | |
| exams: [50, 80, 60, 90], | |
| exercises: [10, 0, 10, 10, 0], | |
| }, | |
| }, | |
| }; | |
| function generateClassRecordSummary(scores) { | |
| function processGradeData(scores, student) { | |
| const NUMBER_OF_EXAMS = 4; | |
| const EXAM_WEIGHT = 0.65; | |
| const EXERCISE_WEIGHT = 0.35; | |
| let examAverage = scores[student].scores.exams.reduce(sumNumbers) / NUMBER_OF_EXAMS; | |
| let exerciseAverage = scores[student].scores.exercises.reduce(sumNumbers); | |
| return Math.round(examAverage * EXAM_WEIGHT + exerciseAverage * EXERCISE_WEIGHT); | |
| } | |
| function processExamData(scores, student, examData) { | |
| scores[student].scores.exams.forEach((exam, index) => { | |
| if (examData[index + 1] === undefined) examData[index + 1] = []; | |
| examData[index + 1].push(exam); | |
| }); | |
| return examData; | |
| } | |
| const sumNumbers = (sum, number) => sum + number; | |
| const formatGradeSummary = (grades) => { | |
| return grades.map((grade) => { | |
| return `${grade} (${letterGrade(grade)})`; | |
| }); | |
| } | |
| const letterGrade = (grade) => { | |
| if (grade < 60) return 'F'; | |
| if (grade < 70) return 'D'; | |
| if (grade < 80) return 'C'; | |
| if (grade < 90) return 'B'; | |
| return 'A'; | |
| } | |
| function formatExamSummary(exams) { | |
| let summary = []; | |
| Object.keys(exams).forEach((exam) => { | |
| let scores = exams[exam]; | |
| let avg = scores.reduce(sumNumbers) / scores.length; | |
| let min = Math.min(...scores); | |
| let max = Math.max(...scores); | |
| summary.push({ average: avg, minimum: min, maximum: max, }); | |
| }); | |
| return summary; | |
| } | |
| let gradeData = []; | |
| let examData = {}; | |
| Object.keys(scores).forEach((student) => { | |
| gradeData.push(processGradeData(scores, student)) | |
| examData = processExamData(scores, student, examData) | |
| }); | |
| return { studentGrades: formatGradeSummary(gradeData), | |
| exams: formatExamSummary(examData), }; | |
| } | |
| console.log(generateClassRecordSummary(studentScores)); |
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