[R] Is = now the same as <- in assigning values

[Peter Dalgaard]

Kenn Konstabel wrote:

> This is legal but doesn't do what you probably expect -- although
> documentation for `<-` says the value (returned by <-) is 'value' i.e.
> whatever is on the right side ...
> 
>> x<-NULL  # just to make sure it's not yet 42
>> foo <- function(a) a
>> foo({x = 42})   # no result

Wrong...

> bar <- foo({x = 42})
> bar
[1] 42


What you're seeing is effectively

> foo(invisible(42))

i.e. the result is there, just not printing.



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