Map each element in a list or vector by an expression.
a list or vector
A lambda expression
A list in which each element is mapped by expr in .data
x <- list(p1 = list(type='A',score=list(c1=10,c2=8)),
p2 = list(type='B',score=list(c1=9,c2=9)),
p3 = list(type='B',score=list(c1=9,c2=7)))
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