Roman

Все в контексте. Привязывая функцию к объекту, this будет объект. У стрелочной функции this всегда будет parent - родитель, если он есть.
Это очень удобно.

const obj = {
   count: 0,
   start() {
      this.intId = setInterval(() => {
     	   if (this.count < 5) {
            this.count++;
            console.log('count', this.count);
     	   } else {
     	   	clearInterval(this.intId);
     	   }
      }, 1000);
   }
};
obj.start();

// document.querySelectorAll('.inputs input').forEach(input => { ... });
input.addEventListener("keypress", (e) => {
        if (e.keyCode == 13) {
            e.preventDefault()
        }
    });

Могу предложить свой API по работе с Cookie:

var Cookie = {

    _params: {
        domain: '',
        path: '/',
        expires: '',
        maxAge: -1,
        sameSite: false,
        secure: false
    },

    _lastCookie: '',

    setDefaultParams (params) {
        this._params = {...this._params, ...params};
    },

    getDefaultParams () {
        return this._params;
    },

    getLastCookie () {
       return this._lastCookie;
    },

    set (key, value, params={}) {

        value = encodeURIComponent(value);
        params = {...this._params, ...params};

        if (params.expires) {
            if (params.expires instanceof Date) {
                params.expires = params.expires.toUTCString();
            } else if (typeof params.expires === 'string') {
                const date = new Date(params.expires);
                params.expires = date.toUTCString();
            }
        }

        let cookie = `${key}=${value};`;
        cookie += params.path ? ` Path=${params.path};` : '';
        cookie += params.domain ? ` Domain=${params.domain};` : '';
        cookie += params.expires ? ` Expires=${params.expires};` : '';
        cookie += params.maxAge > -1 ? ` Max-Age=${params.maxAge};` : '';
        cookie += params.sameSite !== false ? ` SameSite=${params.sameSite};` : '';
        cookie += params.secure === true ? ` Secure;` : '';

        this._lastCookie = cookie;
        document.cookie = cookie;

        return true;
    },

    has (key) {
        return this.getAll().hasOwnProperty(key);
    },

    get (key) {
        return this.getAll()[key];
    },

    getAll () {
        const cookies = {};
        this.getString().split(';').forEach(val => {
            const params = val.split('=').map(el => el.trim());
            cookies[params[0]] = params[1];
        });
        return cookies;
    },

    getString () {
        return document.cookie;
    },

    delete (key) {
        if (!this.has(key)) return false;
        return this.set(key, '', { expires: 'Thu, 01 Jan 1970 00:00:01 GMT', maxAge: 0 });
    }
    
};

if (!Cookie.has('key')) {
    if (confirm('Are you want to save a cookie?')) {
        Cookie.set('key', true, { expires: '2022-12-01T00:00:00' });
    }
} else {
    if (confirm('Are you want to delete a cookie?')) {
        Cookie.delete('key');
    }
}

Как вариант

const col = 20;
    const line = 7;
    const symbol = '&';

    let result = '';
    for (let i = 0; i < line; i++) {
        for (let j = 0; j < col; j++) {
            result += symbol;
        }
        result += "\n";
    }

    alert(result);

Могу предложить как вариант сравнения дат.

const diffDate = (date, date2) => {

        try 
        {
            date = date instanceof Date ? date : new Date(date); 
            date2 = date2 instanceof Date ? date2 : new Date(date2);
        } 

        catch (e) 
        {
            console.log(e);
        }

        return date < date2;
    };

        const rangeDays = 120;
        const createDate = new Date('2022-06-29T15:00:00'); // Строка в формате <input type="datetime" />
        const rangeDate = new Date(createDate.getTime() + (1000*60*60*24*rangeDays));
        const choiceDate = new Date('2022-11-25T15:00:00'); 

        if (!diffDate(createDate, choiceDate) || !diffDate(choiceDate, rangeDate)) {
            console.log('Invalid choosen date.');
            return;
        }

        console.log('[debug][dates]', {
            createDate: createDate.toString(),
            choiceDate: choiceDate.toString(),
            rangeDate: rangeDate.toString()
        });

window.addEventListener("scroll", (e) => {
  const scrollTop = window.pageYOffset || document.documentElement.scrollTop;
  const elem = document.getElementById("target");
  if (elem?.offsetTop <= scrollTop) {
    document.location.hash = elem.id;
  } else {
    document.location.hash = '';
  }
}, false);