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• uniqueBy.js.flow

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package.lib.utils.uniqueBy.js.flow Maven / Gradle / Ivy

// @flow

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

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

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