r - Converting list of varying-length elements to dataframe -

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consider following list of vector elements varying length:

test = list(c(a = 1, b = 2), c(a = 3, c = 1), c(a = 9), c(a = 6, b = 7, c = 8))

i convert list dataframe, while matching names of elements in following fashion:

 #   b  c  #  1  2 na  #  3 na  1  #  9 na na  #  6  7  8

any appreciated. thanks!

library(plyr)  rbind.fill(lapply(test, function(x) as.data.frame(t(x)))) #   b  c #1 1  2 na #2 3 na  1 #3 9 na na #4 6  7  8

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