AtCoder Graduation

Dispaly the year of graduation of the user.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         AtCoder Graduation
// @namespace    matsu7874
// @version      1.0
// @description  Dispaly the year of graduation of the user.
// @author       matsu7874
// @match        https://atcoder.jp/users/*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';
    let getBachelor = function (birthYear) {
        return birthYear + 23;
    }
    let getMaster = function (birthYear) {
        return birthYear + 25;
    }
    let createGraduatedRow = function (birthYear) {
        let descriptionOfGraduated = "B: " + getBachelor(birthYear) + "卒?\nM: " + getMaster(birthYear) + "卒?";
        let row = document.createElement("tr");
        let rowHeader = document.createElement("th");
        rowHeader.innerText = "卒業年度";
        let rowDef = document.createElement("td");
        rowDef.innerText = descriptionOfGraduated;
        row.appendChild(rowHeader);
        row.appendChild(rowDef);
        return row;
    }
    let userInfoTable = document.querySelector("#main-container > div.row > div.col-sm-3 > table > tbody");
    let rows = userInfoTable.getElementsByTagName("tr");
    for (let i = 0; i < rows.length; ++i) {
        if (rows[i].getElementsByTagName("th")[0].innerText === "誕生年") {
            let birthYear = parseInt(rows[i].getElementsByTagName("td")[0].innerText, 10);
            userInfoTable.appendChild(createGraduatedRow(birthYear));
            break;
        }
    }
})();