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Mathematica > Core Language > Expressions > Parts of Expressions >

Built-in Mathematica Symbol

MapAll (//@)

MapAll[f, expr]
or f//@expr applies f to every subexpression in expr.

Apply f to every subpart of an expression:

Alternative input form:

Apply f to every subpart of an expression:

Alternative input form:

MapAll can be used on expressions with any head:

The function can be mapped onto the heads as well:

MapAll can be used on sparse arrays:

Apply f to heads as well as ordinary parts of expressions:

Show nesting structure of an expression:

Leaves are visited before roots:

MapAll is equivalent to a specific level specification in Map:

MapAll maps also around the whole expression; Map[f, expr,

] does not: