How to get Course Id from Classroom URL? - google-apps-script

Question

Goal: I want to quickly connect to a Google Classroom using a Google Classroom URL via Google Apps Script.
Problem: Need help filtering Map of courses by URL.
Background:
Classroom API has little documentation for GAS. Furthermore, COURSE_ID is used for nearly all connections. I can map the active courses, but I cannot filter the map. The code below originated from Yagisanatode with modifications in an attempt to map active courses by URL. Changing the Logger to (courseData) reveals the creation of the double array.
function findCourseByUrl() {
const courseList = Classroom.Courses.list({"courseStates":["ACTIVE"]}).courses;
const courseData = courseList.map(course => {
let ownerName = Classroom
.Courses
.Teachers
.get(course.id, course.ownerId)
.profile
.name
.fullName;
return `[${course.name}, ${course.id}, ${ownerName}, ${course.alternateLink}]`;
});
const link = 'https://classroom.google.com/c/YOUCLASSROOMURL'; //change this
const data = courseData.filter(function(item){return item[4] === link;});
Logger.log(data);
};
Any help would be appreciated. I'm stuck.

Answer 1

Answer:
link is not defined since it is outside of the courseData.filter(function(item){}). The solution is to call a global variable or create a conditional with the declared variable within the function(item).
The toString is looking for an exact match for the URL text, which is naturally unique.
Video reference: https://youtu.be/PT_TDhMhWsE
Code:
function findCourseByUrl() {
const courseList = Classroom.Courses.list({"courseStates":["ACTIVE"]}).courses;
const courseData = courseList.map(course => {
let ownerName = Classroom
.Courses
.Teachers
.get(course.id, course.ownerId)
.profile
.name
.fullName;
return `[${course.name}, ${course.id}, ${ownerName}, ${course.alternateLink}]`;
});
const filterCourse = function(item){
let link = 'https://classroom.google.com/c/YOURCOURSEURL' ///Change this or replace with a global variable
if(item.toString().indexOf(link) === -1){
return false;
} else {
return true
}
};
let theCourse = courseData.filter(filterCourse); //this could be a return if called by function in Test.gs
Logger.log(theCourse); //remove if using a function with console.log in Test.gs
};