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09-closure-exercise.js
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09-closure-exercise.js
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function defineWorkshop() {
var currentEnrollment = [];
var studentRecords = [];
var publicAPI = {
addStudent,
enrollStudent,
printCurrentEnrollment,
enrollPaidStudents,
remindUnpaidStudents,
};
return publicAPI;
// ********************************
function addStudent(id, name, paid) {
studentRecords.push({ id, name, paid });
}
function enrollStudent(id) {
if (!currentEnrollment.includes(id)) {
currentEnrollment.push(id);
}
}
function printCurrentEnrollment() {
printRecords(currentEnrollment);
}
function enrollPaidStudents() {
currentEnrollment = paidStudentsToEnroll();
printCurrentEnrollment();
}
function remindUnpaidStudents() {
remindUnpaid(currentEnrollment);
}
function getStudentFromId(studentId) {
return studentRecords.find(matchId);
// *************************
function matchId(record) {
return record.id == studentId;
}
}
function printRecords(recordIds) {
var records = recordIds.map(getStudentFromId);
records.sort(sortByNameAsc);
records.forEach(printRecord);
}
function sortByNameAsc(record1, record2) {
if (record1.name < record2.name) return -1;
else if (record1.name > record2.name) return 1;
else return 0;
}
function printRecord(record) {
console.log(
`${record.name} (${record.id}): ${record.paid ? "Paid" : "Not Paid"}`
);
}
function paidStudentsToEnroll() {
var recordsToEnroll = studentRecords.filter(needToEnroll);
var idsToEnroll = recordsToEnroll.map(getStudentId);
return [...currentEnrollment, ...idsToEnroll];
}
function needToEnroll(record) {
return record.paid && !currentEnrollment.includes(record.id);
}
function getStudentId(record) {
return record.id;
}
function remindUnpaid(recordIds) {
var unpaidIds = recordIds.filter(notYetPaid);
printRecords(unpaidIds);
}
function notYetPaid(studentId) {
var record = getStudentFromId(studentId);
return !record.paid;
}
}