r - list - rename specific data.frames column with lapply -

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i have got list 10 data.frames , need rename 1 column of each data.frame. column rename no. 7 , think can trick lapply.

here tried without success:

lst <- lapply(lst, function(x) colnames(x)[7] <- 'new_name')

i think close solution missing something. thanks

you need use {} , return x:

lst <- lapply(lst, function(x) {colnames(x)[7] <- 'new_name'; x})

or 

lst <- lapply(lst, function(x) {   colnames(x)[7] <- 'new_name'   x       })

as reproducible example, use

lapply(list(iris, iris), function(x) {colnames(x)[3] <- "test"; x})

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