GPA Calculator

gpa.js

// Follow instructions below: 
// 
// 1. Go to https://www2.adst.keio.ac.jp/rcs/topMenu
// 2. Open Chrome Developer Console
// 3. Paste Codes

const scoreOf = []; scoreOf['Ａ'] = 4; scoreOf['Ｂ'] = 3; scoreOf['Ｃ'] = 2; scoreOf['Ｄ'] = 0;
const score = Array.prototype.slice.call(document.querySelectorAll('table tbody table.User tbody tr')).filter((tr) => tr.childNodes.length == 8).slice(1).map((course) => scoreOf[course.childNodes[2].innerText] * course.childNodes[3].innerText).reduce((total, score) => total + score);
const totalDegrees = Array.prototype.slice.call(document.querySelectorAll('table tbody table.User tbody tr')).filter((tr) => tr.childNodes.length == 8).slice(1).map((course) => parseInt(course.childNodes[3].innerText)).reduce((total, score) => total + score);

score / totalDegrees;