function getNonOptionalPart(members, membersOptionals) {
			let i = 0;
			while (i < members.length && membersOptionals[i] === false) i++;
			return i !== members.length ? members.slice(0, i) : members;
		}
@param {string[]} members members
@param {boolean[]} membersOptionals members Optionals
@returns {string[]} a non optional part