uniqueBy.js.flow
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uniqueBy.js.flow
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			// @flow

			export default function uniqueBy<T>(arr: Array<T>, fn: T => any): Array<T> {
			const identifiers = new Set();

			return arr.filter(item => {
			const identifier = fn(item);

			if (!identifiers.has(identifier)) {
			identifiers.add(identifier);
			return true;
			}
			});
			}