function-nesting.js

onSearchSuccess = (places) => {
  const changeHeader = (num, callback) => {
    const header = { formHeader: `We Found ${num} Local Caregivers` };
    this.setState(
      ...(callback ? [header, callback] : [header])
    );
  };

  Array.isArray(places) && (
    places.reduceRight((acc, place, index) =>
      changeHeader.bind(null, index, () => setTimeout(acc, 25)),
      changeHeader.bind(null, places.length)
    )
  )();
};