list.first: Find the first element that meets a condition

In rlist: A Toolbox for Non-Tabular Data Manipulation

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

Example output

$type
[1] "B"

$score
$score$c1
[1] 9

$score$c2
[1] 9


NULL

rlist documentation built on Sept. 5, 2021, 5:30 p.m.