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R function to complete lists and make missing elements explicitly NA
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| complete_list <- function(.list, .names) { | |
| if (missing(.names)) return(.list) | |
| .list[.names[! (.names %in% names(.list)) ]] <- NA | |
| return(.list) | |
| } | |
| a <- list(b = 1, c = 2) | |
| a <- complete_list(a, c("a", "b", "c")) | |
| dplyr::coalesce(a$a, a$b, a$c, 0) |
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