Section 12. Magistrates, aldermen and justices of the peace

An alderman, justice of the peace or magistrate:

(a) May complete his term, exercising the jurisdiction provided by law and with the method of compensation provided by law prior to the adoption of this article;

(b) Shall be deemed to have taken and passed the examination required by this article for justices of the peace if he has completed one full term of office before creation of a magisterial district, and

(c) At the completion of his term, his office is abolished.

(d) Except for officers completing their terms, after the first Monday in January, 1970, no judicial function of the kind heretofore exercised by these officers, by mayors and like officers in municipalities shall be exercised by any officer other than the one justice of the peace elected or appointed to serve in that magisterial district.