Gaao ka chhora

R. Biggest surprise. y <- 0 x <- function() {   y <- 5 } x() print(y) In the above code, Every object programmer or C programmer would expect, value of y to be printed as 5 after this code block gets executed. But it doesnt work this way in R. If you want to update global variable in R inside a function u have to use <<- instead of <- as assignment inside the function. so, x <- function() {   y <<- 5 } Would update the global variable y correctly :-). Was a big surprise for me.