Created
September 6, 2024 08:23
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R functions – convenient extensions of data.table's `setnames` function
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| library(magrittr) | |
| library(data.table) | |
| setnamesWithArrows <- function(dt, ...) { | |
| pairs <- | |
| substitute(list(...)) %>% | |
| as.list %>% | |
| tail(-1) %>% | |
| lapply(. %>% as.list %>% tail(-1) %>% rev) | |
| from <- | |
| pairs %>% | |
| sapply(. %>% .[[1]] %>% as.character) | |
| to <- | |
| pairs %>% | |
| sapply(. %>% .[[2]] %>% as.character) | |
| setnames(dt, from, to) | |
| } | |
| setnamesWithFunction <- function(dt, FUN) | |
| setnames(dt, | |
| colnames(dt), | |
| colnames(dt) %>% sapply(FUN)) | |
| # ### Usage examples | |
| # | |
| # > x <- data.table(a = 1, b = 2) | |
| # | |
| # > x %>% setnamesWithArrows(a -> Aa, b -> bB) %>% print() | |
| # | |
| # Aa bB | |
| # <num> <num> | |
| # 1: 1 2 | |
| # | |
| # > x %>% setnamesWithFunction(toupper) %>% print() | |
| # | |
| # AA BB | |
| # <num> <num> | |
| # 1: 1 2 | |
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