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- <font color="#800000"><b>Conclusion</b></font>
There are two conclusions for this page.
- R uses "Pass by value".
- R uses "Default initialize".
- <font color="#800000"><b>Function 1</b></font>
First, create an R code file "<a href="./example/function/func_1.r" target="_blank">func_1.r</a>" contains this,
run it and trace the result to see the difference.
```
# File name: func_1.r
hello <- function(input){
a <- c("Hello", "world", input, "!")
input <- NULL
molas <- "molas"
ret <- paste(a, collapse = " ")
ret
}
molas <- "MOLAS"
input <- c("again,", molas)
input
hello(input)
molas
input
hello()
hello(NULL)
```
- <font color="#800000"><b>Function 2</b></font>
First, create an R code file "<a href="./example/function/func_2.r" target="_blank">func_2.r</a>" contains this,
run it and trace the result to see the difference.
```
# File name: func_2.r
hello <- function(a, ...){
ret <- paste(a, ...)
ret
}
test <- function(input = "molas") {
a <- c("Hello", "world", input, "!")
input <- NULL
molas <- "molas"
ret <- hello(a, collapse = " ")
ret
}
molas <- "MOLAS"
input <- c("again,", molas)
input
test(input)
molas
input
test()
test(NULL)
```
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<div w3-include-html="../preamble_tail_date.html"></div>
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