Looping a function I created over a list of dataframes in R

Question

I have 18 data set from 2002-2020 that I want to add a year column to before I bind them all together. I created this function:

year_add <- function(x,y) {mutate(x, Year =y)} ## adds the year variable to data frame

which works perfectly for one data frame, but I don't know how to run it through a list of all 18 data sets. I have tried for loops and lapply, but can't seem to get any of them to work... Any suggestions?

FYI, to run the code on one data set, I simply put: year_add(data2002, "2002")

Try to make this a [reproducible example](https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example). You tried loops and lapply how? — camille, Feb 04 '20 at 15:03
Hard to answer without reprodicible example,did you look into map (from the purrr) package. — Annet, Feb 04 '20 at 15:12

score 0 · Accepted Answer · answered Feb 04 '20 at 15:08

0

Try

names(list_of_dataframes) <- 2002:2020
dplyr::bind_rows(list_of_dataframes, .id = "Year")

answered Feb 04 '20 at 15:08

robertdj

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Looping a function I created over a list of dataframes in R

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