How to use the iter-tools/es5/filter function in iter-tools

filter(filterFn) {
      return this.__doCollectionTransform(
        filter(item => filterFn(item, item, ...this.__selfParam)),
      );
    }

filter(filterFn) {
      return this.__doCollectionTransform(
        filter(([key, value]) => filterFn(value, key, ...this.__selfParam)),
      );
    }

filterNot(filterFn) {
      return this.__doCollectionTransform(
        filter((value, i) => !filterFn(value, i, ...this.__selfParam)),
      );
    }