Passing arguments in functions in R

Question

So I'm trying to create a function which will take an argument from a list and return it into a dataframe. So far I got close with this sample code, but i've become stuck for a few weeks now.

# list of pets
pets = list("cats", "dogs")

# comment link
search_url = paste("https://duckduckgo.com/?q=", pets[])

# empty data frame for the pets
petsX <- data.frame()

# function for x in pets
getSearch <- function(x) {
  petsX <- ( search_url [x] )
}

getSearch(1)
# I want this to be:
# https://duckduckgo.com/?q=cats

Any help or guidance in the right direction would be truly appreciated.

Hi M4rk3h11! Welcome to stack overflow. It's a bit unclear where/if an error occurs and what the desired output should be (apart from your code comment). Maybe put an error and a "desired output" in separate code boxes? Also consider creating a question title that's more problem-specific to get attention from the right people. — Andre Wildberg
– Andre Wildberg, Commented Feb 22, 2021 at 16:33
Hi Andre, thanks for the feedback. I'll try to be more specific from now on :) — Mark
– Mark, Commented Feb 23, 2021 at 10:05

Claudiu Papasteri · Accepted Answer · 2021-02-22 16:22:41Z

1

I am not sure why you need the petsX dataframe at all. You already have all search terms in the list. It would probably be better if you store the results of the function in dataframe when you use it.

# list of pets
pets = list("cats", "dogs")

# comment link
search_url = paste("https://duckduckgo.com/?q=", pets, sep = "")

# function for x in pets
getSearch <- function(x) {
  search_url[[x]]
}

getSearch(1)
#> [1] "https://duckduckgo.com/?q=cats"
getSearch(2)
#> [1] "https://duckduckgo.com/?q=dogs"

^{Created on 2021-02-22 by the reprex package (v0.3.0)}

edited Feb 22, 2021 at 16:22

answered Feb 22, 2021 at 16:17

Claudiu Papasteri

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