function findRangesImmutable()

in src/model/immutable/findRangesImmutable.js [23:46]

• 21 lines of code
• 5 McCabe index (conditional complexity)

function findRangesImmutable<T>(
  haystack: List<T>,
  areEqualFn: (a: T, b: T) => boolean,
  filterFn: (value: T) => boolean,
  foundFn: (start: number, end: number) => void,
): void {
  if (!haystack.size) {
    return;
  }

  let cursor: number = 0;

  haystack.reduce((value: T, nextValue, nextIndex) => {
    if (!areEqualFn(value, nextValue)) {
      if (filterFn(value)) {
        foundFn(cursor, nextIndex);
      }
      cursor = nextIndex;
    }
    return nextValue;
  });

  filterFn(haystack.last()) && foundFn(cursor, haystack.count());
}