| list.first | R Documentation | 
Find the first element that meets a condition
list.first(.data, cond)
.data | 
 A   | 
cond | 
 a logical lambda expression  | 
list.last
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)))
list.first(x, score$c1 < 10)
list.first(x, score$c1 < 9 || score$c3 >= 5) # NULL for all results are NA or FALSE
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