list.first {rlist}

Find the first element that meets a condition

Description

Find the first element that meets a condition

Usage

list.first(.data, cond)

Arguments

.data

A list or vector

cond

a logical lambda expression

See Also

list.last

Examples

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