Why does b have a value?

问题

Why does b have a value? I think b should be null, because there is no return in function f.

f <- function(){
  a <- 10
}

b <- f()

b
# [1] 10

回答1:

<- operator returns assignement invisibly, which allows

b <- a <- 1
b
a

> b
[1] 1
> a
[1] 1

来源：https://stackoverflow.com/questions/63950864/why-does-b-have-a-value