[operation] examine first element [Ada] First_Element [C++] front [Java] peekFirst [Perl] $array[0] [Python] [0] [Ruby] first [JavaScript] [0] [PHP] 
reset
a r r a y _ p u s h
a r r a y _ u n s h i f t
a r r a y _ p o p
a r r a y _ s h i f t
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r e s e t