Михаил Р.

var text = 'Привет, мир!';

var u8a = new TextEncoder().encode(text);

var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

var bytes = u8a, i, len = bytes.length, base64 = '';

for (i = 0; i < len; i += 3) {
	base64 += chars[bytes[i] >> 2];
	base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
	base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
	base64 += chars[bytes[i + 2] & 63];
}

if (len % 3 === 2) {
	base64 = base64.substring(0, base64.length - 1) + '=';
}

else if (len % 3 === 1) {
	base64 = base64.substring(0, base64.length - 2) + '==';
}

console.log(base64);

var text = 'Привет, мир!';

var blob = new Blob([ text ]);

var reader = new FileReader();

reader.readAsDataURL(blob);

reader.onload = function() {
	
	var base64 = reader.result.split(',')[1];
	
	console.log(base64);
	
};

const result = arr2.map(function(n) {
  return Object.fromEntries(this.map(m => [ m[1], n[m[0]] ]));
}, arr1.flatMap(Object.entries));

const keys = Object.entries(Object.assign({}, ...arr1));
const result = arr2.map(n => keys.reduce((acc, m) => (acc[m[1]] = n[m[0]], acc), {}));

const result = arr1.filter(function(n) {
  return !this.has(n[0]);
}, new Set(arr2.map(n => n[0])));

function diff(data1, data2, compare = (a, b) => a === b) {
  const arr = Array.isArray(data2) ? data2 : [...data2];
  const result = [];

  for (const n of data1) {
    if (!arr.some(m => compare(m, n))) {
      result.push(n);
    }
  }

  return result;
}

const result = diff(
  arr1,
  arr2,
  (a, b) => a.length === b.length && a.every((n, i) => Object.is(n, b[i]))
);

const diff = function*(data1, data2, keys = n => n) {
  const tree = new Map;

  for (const n of data2) []
    .concat(keys(n))
    .reduce((p, c) => p.set(c, p.get(c) ?? new Map).get(c), tree)
    .set(this, true);

  for (const n of data1) {
    if (![].concat(keys(n)).reduce((p, c) => p?.get(c), tree)?.get(this)) {
      yield n;
    }
  }
}.bind(Symbol());

const result = [...diff(arr1, arr2)];

curl -L -o "go1.19.2.linux-amd64.tar.gz" "https://dl.google.com/go/go1.19.2.linux-amd64.tar.gz"
sudo tar xvf "go1.19.2.linux-amd64.tar.gz" -C /usr/local
echo 'export GOROOT=/usr/local/go' >> ~/.bashrc
echo 'export PATH=$GOROOT/bin:$PATH' >> ~/.bashrc
source ~/.bashrc

потом я хотел настроить перменную GOPATH, а там как я понял надо указать путь до ГО и там выбрать папку scr.

Знание или гугление?

return (
    <div>
      {countryNames && countryNames.filter((item, index, array) => {
           return index > 0 ? item.COUNTRY_NAME !== array[index - 1].COUNTRY_NAME : true
      }).map((vyvod) => {
           let country = vyvod.COUNTRY_NAME
           return <div> {country}</div> // НЕ ЗАБЫВАЕМ ПРО KEY!!!
    })}
    </div>
  );

.then((res) => {
   setCountryNames(() => {
      return res.DATA.filter((item, index, array) => {
           return index > 0 ? item.COUNTRY_NAME !== array[index - 1].COUNTRY_NAME : true
      })
   })
})

SELECT * from 'Клиенты' 
  WHERE (surname Like '%Ива%' or name Like '%Ива%' or secondname Like '%Ива%') 
    AND (surname Like '%Никол%' or name Like '%Никол%' or secondname Like '%Никол%')

SELECT * from 'Клиенты' 
  WHERE CONCAT_WS(',' surname, name, secondname) LIKE '%Ива%'
    AND CONCAT_WS(',' surname, name, secondname) LIKE'%Никол%'

9007199254740991 // максимальное безопасное целое
17848907461544179 // ваш ID больше – происходят округления