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Map
 Map[f, expr] or f /@ expr applies f to each element on the first level in expr.
Map[f, expr, levelspec] applies f to parts of expr specified by levelspec.
Examples: Map[f,  a, b, c ]   ; Map[f, a + b + c]  .
Level specifications are described in Section A.3.6.
The default value for levelspec in Map is {1}.
Examples: Map[f,   a,b , c,d  ]  ; Map[f,   a,b , c,d  , 2]  ; Map[f,   a,b , c,d  , -1]  .
See The Mathematica Book: Section 2.2.4.
See also: Apply, Scan, MapAll, MapAt, MapIndexed, MapThread, Level, Operate.
Further Examples
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