Storing a Function in a Separate File in R

file.R

# calling the functions
# this is the file where we will call the functions in fun.R and times.R
times <- dget("times.R")
times(-4:4, 2)

source("fun.R")
mult(-4:4, 2)

fun.R

# defining the function
mult <- function(x, y) {
    x*y
}

times.R

# defining the function
function(x, y) {
    x*y
}

thanks you very much cristal clear!

i have a seperate file in package which stores a function when i used a source in inlcude in another file file of same package it is not working and give me an error on travis ???
anyone please help me out?
thanks