R: Create Variable and Display Value in Single Command

Question

Is there a way to both create a variable and output its value in a single command? In other words, concatenating both lines below into a single command?

x <- mean(1:7)
x

or just dart your eyes over to the Environment pane in RStudio — Hack-R
– Hack-R, Commented Nov 16, 2016 at 1:58

Pierre L · Accepted Answer · 2016-11-16 02:08:51Z

1

Wrap the command in parantheses.

(x <- mean(1:7))

Knowing this you can do a few cool R tricks like creating an object and using it in the same expression. The development team does this all over the R source code. This is a double nest from apply:

if (length(dn.call) && !is.null(n1 <- names(dn <- dn.call[1])) && 
        nzchar(n1) && length(ans.names) == length(dn[[1]]))

Be careful with these newfound powers, your co-workers will never be able to read your code again :)

edited Nov 16, 2016 at 2:08

answered Nov 16, 2016 at 2:02

Pierre L

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