Understanding this Collatz function code in R -


i new r programming language , want sorry kind of easy question , have dealed code of collatz conjecture in r. actually, have understood first 2 parts, dont logic of while loop in part 3 , need of n.total <- null. in addition, dont understand reason why combining whole set vector in last step c(n.total,n). thank help!

part 1:  is.even <- function(x){   if(x%%2==0){     print("true")   }else{     print("false")   } }  part 2:  collatz <- function(n){   if (is.even(n)) {     n/2   }else{       3*n+1     } }  part 3:  n <- 27 n.total <- null while(n != 1){   n <- collatz(n)   n.total <- c(n.total,n) }  n.total 

collatz <- function(n, acc=c()) {   if(n==1) return(c(acc, 1));   collatz(ifelse(n%%2==0, n/2, 3*n +1), c(acc, n))}

collatz(5) return: 5 16 8 4 2 1


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