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/**
 * Считаем кол-во запусков функции
 */
function selfCounting() {
	selfCounting.callsCount = selfCounting.callsCount || 0;

	return ++selfCounting.callsCount;
}

console.log(selfCounting()); // -> 1
console.log(selfCounting()); // -> 2

for (let i = 0; i < 10; i++) {
	selfCounting();
}

console.log(selfCounting()); // -> 13