pl: Pluralize word
In toniprice/jutebag: Sundry Utility Functions

Description Usage Arguments Details Value Examples

Converts a word into a plural (English).

1	pl(singular, num, irregular = NULL)

`singular`	character: singular form of the word.
`num`	integer: number of items. `num = 1` will give the singular form; `num = 0` or `num > 1` will give the plural form.
`irregular`	character: plural form of the word if it is irregular and needs to be explicitly supplied.

This function would usually be used in a context where the number of items num is a variable and not known at run-time.

character: singular or plural form of the word, depending on the value of num.

pl("shoe", 2)
pl("shoe", 1)

n <- 0
pl("thing", n)

pl("sheep", 5)           # => incorrect (gives "sheeps")
pl("sheep", 5, "sheep")  # => correct   (gives "sheep")