Parse wrong questions from quiz details

QuizDetailParser.js

class TabularParser {

    getNthCol(row, n) {
        return row.querySelector(`td:nth-child(${n})`);
    }

    getNthColText(row, n) {
        return this.getNthCol(row, n).innerText;
    }

    parse(doc) {
        var data = [];
        var rows = doc.querySelectorAll(`.${this.tableContainerClass}>table>tbody>tr`);

        rows.forEach((row) => {
            if (!row.innerText.match(/No data available/i))
                data.push(this.buildObj(row));
        })

        return data;
    }
}

class QuizDetailParser extends TabularParser {

    constructor() {
        super();
        this.tableContainerClass = "allowance_table";
    }

    buildObj(row) {
        return new QuizDetail(
            parseInt(this.getNthColText(row, 1)),
            this.getNthCol(row, 3).children[0].cloneNode(true),
            this.getNthCol(row, 4).children[0].cloneNode(true),
            this.getNthCol(row, 5).children[0].cloneNode(true),
        )
    }
}

class QuizDetail {

    constructor(index, question, crctAns, wrngAns) {
        this.index = index;
        this.text = question;
        this.correctAns = crctAns;
        this.wrongAns = wrngAns;
    }

    getJSON() {
        return {
            text: this.text.innerText.trim(),
            correctAns: this.correctAns.innerText.trim(),
            wrngAns: this.wrongAns.innerText.trim()
        }
    }
}