[R] does column exist?

[Chuck Cleland]

How about is.null(df$X)==FALSE ?

Omar Lakkis wrote:
> How do I test if a data.frame has a column named X?
> exists(o) checks if the object exists or not, I want to test if a
> data.frame object (df) has a column names(X), something like:
> exists(df$X)
> 
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Chuck Cleland, Ph.D.
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