BufferedPool.js
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BufferedPool.js
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	function bufferedPool(getter, picker) {
	let pool = [];
	let promiseOfPool = getter().then(results => {
	pool = results;
	return pool;
	});
	return function() {
	return promiseOfPool.then(function() {
	if (pool.length === 0) {
	throw new Error("Empty array");
	}
	return picker(pool);
	});
	};
	}

	export function popRandomElement(array) {
	let index = Math.floor(Math.random() * array.length);
	let lastIndex = array.length - 1;
	[array[index], array[lastIndex]] = [array[lastIndex], array[index]];
	return array.pop();
	}

	export default bufferedPool;