Created
June 8, 2023 14:17
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Find index of name in nested list
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find_name_index <- function(haystack, needle, idx=c()) { | |
if (hasName(haystack, needle)) { | |
c(idx, which(names(haystack)==needle)) | |
} else if (is.list(haystack)) { | |
for (i in seq_along(haystack)) { | |
obj <- haystack[[i]] | |
ret <- Recall(obj, needle, c(idx,i)) | |
if (!is.null(ret)) return(ret) | |
} | |
} else { | |
NULL | |
} | |
} |
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my_list <- list( | |
"first_node" = list( | |
"group_a" = list( | |
"E001" = 1:5, | |
"E002" = list( | |
"F001" = 6:10, | |
"F002" = 11:15 | |
) | |
), | |
"group_b" = list( | |
"XY01" = list( | |
"Z1" = LETTERS[1:5], | |
"Z2" = LETTERS[6:10], | |
"Z3" = list( | |
"ZZ1" = LETTERS[1], | |
"ZZ2" = LETTERS[2], | |
"ZZ3" = LETTERS[3] | |
) | |
), | |
"YZ" = LETTERS[11:15] | |
), | |
"group_c" = list( | |
"QQQQ" = list( | |
"RRRR" = 200:300 | |
) | |
) | |
), | |
"second_node" = list( | |
"group_d" = list( | |
"L1" = 99:101, | |
"L2" = 12 | |
) | |
) | |
) | |
pos <- find_name_index(my_list, "XY01") | |
pos | |
# [1] 1 2 1 | |
my_list[[pos]] |
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