github.com/gotd/td/tg.HelpTermsOfServiceUpdateClassArray.Retain (method)

one use

	github.com/gotd/td/tg (current package)
		tl_help_terms_of_service_update_slices_gen.go#L57: func (s HelpTermsOfServiceUpdateClassArray) Retain(keep func(x HelpTermsOfServiceUpdateClass) bool) HelpTermsOfServiceUpdateClassArray {