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based on an earlier version of the Wolfram Language.
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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.
  • Map uses standard level specifications:
nlevels 1 through n
Infinitylevels 1 through Infinity
{n}level n only
{n1,n2}levels n1 through n2
  • The default value for levelspec in Map is {1}.
  • A positive level n consists of all parts of expr specified by n indices.
  • A negative level -n consists of all parts of expr with depth n.
  • Level -1 consists of numbers, symbols and other objects that do not have subparts.
  • Level 0 corresponds to the whole expression.
  • With the option setting Heads->True, Map includes heads of expressions, and their parts.
  • Map always effectively constructs a complete new expression, and then evaluates it.
  • If expr is a SparseArray object, Map[f, expr] applies f to the values or subarrays that appear in expr.
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