Turn column of df into a string?

General
1 
mydf <- data.frame("sample"=c("blue","red","yellow","green"))

mydf 

  sample
1   blue
2    red
3 yellow
4  green

How can I make one string out of this with "OR" in between each entry, like this:

"blue OR red OR yellow OR green" ?

2

Do this:

paste(mydf[["sample"]], collapse=" OR ")
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