Function _setFieldArray

src/logic/createFormControl.ts:268–324

(
    name,
    values = [],
    method,
    args,
    shouldSetValues = true,
    shouldUpdateFieldsAndState = true,
  )

  };

  const _setFieldArray: BatchFieldArrayUpdate = (
    name,
    values = [],
    method,
    args,
    shouldSetValues = true,
    shouldUpdateFieldsAndState = true,
  ) => {
    if (args && method && !_options.disabled) {
      _state.action = true;
      if (shouldUpdateFieldsAndState && Array.isArray(get(_fields, name))) {
        const fieldValues = method(get(_fields, name), args.argA, args.argB);
        shouldSetValues && set(_fields, name, fieldValues);
      }

      if (
        shouldUpdateFieldsAndState &&
        Array.isArray(get(_formState.errors, name))
      ) {
        const errors = method(
          get(_formState.errors, name),
          args.argA,
          args.argB,
        );
        shouldSetValues && set(_formState.errors, name, errors);
        unsetEmptyArray(_formState.errors, name);
      }

      if (
        (_proxyFormState.touchedFields ||
          _proxySubscribeFormState.touchedFields) &&
        shouldUpdateFieldsAndState &&
        Array.isArray(get(_formState.touchedFields, name))
      ) {
        const touchedFields = method(
          get(_formState.touchedFields, name),
          args.argA,
          args.argB,
        );
        shouldSetValues && set(_formState.touchedFields, name, touchedFields);
      }

      if (_proxyFormState.dirtyFields || _proxySubscribeFormState.dirtyFields) {
        _updateDirtyFields();
      }

      _subjects.state.next({
        name,
        isDirty: _getDirty(name, values),
        dirtyFields: _formState.dirtyFields,
        errors: _formState.errors,
        isValid: _formState.isValid,
      });
    } else {
      set(_formValues, name, values);
    }
  };