Why use pipeable operator in function?

General
#1 
# Write a function to convert bushels to kg
bushels_to_kgs <- function(bushels, crop) {
  bushels %>%
    # Convert bushels to lbs for this crop
    bushels_to_lbs(crop) %>%
    # Convert lbs to kgs
    lbs_to_kgs()
}

bushels has already been set in the argument of function. Why in the second line, we write bushels agin?

#2

It has little sense to specify an argument and not using it (?)

You should not confuse this with the construction

bushels %>%
  bushels
#3

Hey Tung,

The bushels argument within function() is more of an input than anything else. This is where you would enter your number of bushels when you call the bushels_to_kg() later on.

The second line mention of "bushels" is (for this function example) simply where your input entry from earlier fits within the pipeline ('%>%') that you've captured with this function. The "second line" is putting your entry to use.

Hope this helps