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(1) Subject to the provisions of this Part, the following persons are citizens by operation of law, that is to say:
(a) every person born before Malaysia Day who is a citizen of the Federation by virtue of the provisions contained in Part I of the Second Schedule; ³and
(b) every person born on or after Malaysia Day, and having any of the qualifications specified in Part II of the Second Schedule. (Art. 14)

A citizen of the Federated States of Micronesia who is recognized as a citizen of another nation shall, within 3 years of his 18th birthday, or within 3 years of the effective date of this Constitution, whichever is later, register his intent to remain a citizen of the Federated States and renounce his citizenship of another nation. If he fails to comply with this Section, he becomes a national of the Federated States of Micronesia. (Art. III, Sec. 3)

Every person born in Barbados after 29th November 1966 shall become a citizen of Barbados at the date of his birth: Provided that a person shall not become a citizen of Barbados by virtue of this section if at the time of his birth—
(a) his father possesses such immunity from suit and legal process as is accorded to an envoy of a foreign sovereign State accredited to Barbados and neither of his parents is a citizen of Barbados; or
(b) his father is an enemy alien and the birth occurs in a place then under occupation by the enemy. (Sec. 4)

... No individual of the nation of Afghanistan shall be deprived of citizenship. The citizenship and asylum related matters shall be regulated by law. (Art. 4)

10. Management Sector
…
(j) Citizenship, naturalization, termination and revocation of citizenship, citizenship scrutiny and registration;
... (Schedule One, Union Legislative List [Section 96])

(1) Except as provided in Subsection (4), a person who has resided continuously in the country for at least eight years may apply to the Minister responsible for citizenship matters to be naturalized as a citizen, and the Minister may, if he is satisfied as to the matters referred to in Subsection (2), in his deliberate judgement (but subject to Division 4 (Citizenship Advisory Committee)), grant or refuse the application.
(2) To be eligible for naturalization, a person must-
(a) be of good character; and
(b) intend to reside permanently in the country; and
(c) unless prevented by physical or mental disability, speak and understand Pisin or Hiri Motu, or a vernacular of the country, sufficiently for normal conversational purposes; and
(d) have a respect for the customs and cultures of the country; and
(e) be unlikely to be or become a charge on public funds; and
(f) have a reasonable knowledge and understanding of the rights, privileges, responsibilities and duties of citizenship; and
(g) subject to Section 64, renounce, in such manner as is prescribed by or under an Act of the Parliament, any other citizenship and make the Declaration of Loyalty.
(3) If an applicant for naturalization so requests, any child of the applicant who is under voting age at the time when the applicant is naturalized becomes a citizen by naturalization on the naturalization of the applicant.
… (Sec. 67)

The following are Brazilians:
I – by birth:
a) those born in the Federative Republic of Brazil, even if of foreign parents, provided that they are not at the service of their country;
b) those born abroad, of a Brazilian father or a Brazilian mother, provided that either of them is at the service of the Federative Republic of Brazil;
c) those born abroad, to a Brazilian father or a Brazilian mother, provided that they are registered with a competent Brazilian authority, or come to reside in the Federative Republic of Brazil, and opt for the Brazilian nationality at any time after reaching majority;
II – naturalized:
a) those who, as set forth by law, acquire Brazilian nationality, it being the only requirement for persons originating from Portuguese-speaking countries the residence for one uninterrupted year and good moral repute;
b) foreigners of any nationality, resident in the Federative Republic of Brazil for over fifteen uninterrupted years and without criminal conviction, provided that they apply for the Brazilian nationality.
…
Paragraph 4. Loss of nationality shall be declared for a Brazilian who:
I – have their naturalization revoked by court ruling, in cases of fraud related to the naturalization process or of attack against the constitutional order and the democratic state;
II – formally request the renunciation of their Brazilian nationality before the competent Brazilian authority, except in situations that would result in statelessness.
... (Art. 12)

The rules which govern the Saudi Arabian nationality shall be defined by the law. (Basic Law, Art. 35)

Every person who on the Day of Independence is a person of ni-Vanuatu ancestry and has the nationality or citizenship of a foreign state or the status of an optant shall become a citizen of Vanuatu if he makes an application, or an application is made on his behalf by his parent or lawful guardian. (Art. 10)

Cubans may not be deprived of their citizenship, except for legally sanctioned causes.
The law establishes the procedure to be followed in order to formalize the loss or renouncement of citizenship as well as the authorities empowered to decide in these cases. (Art. 38)