Format A List Of Items By Locale

The Intl module includes a ListFormat object which can be used to format a list of items in a consistent way across locales.

I've reinvented the wheel of writing a helper function numerous times across projects for formatting a list of items that accounts for formatting based on how many items there are. This built-in function handles that with the added benefit of working across locales.

Here are lists of three, two, and one items formatted in the long styles for US english.

> const formatter = new Intl.ListFormat('en', { style: 'long', type: 'conjunction' });
undefined

> formatter.format(['Alice', 'Bob', 'Carla'])
'Alice, Bob, and Carla'

> formatter.format(['Coffee', 'Tea'])
'Coffee and Tea'

> formatter.format(['Taco'])
'Taco'

The difference between long and short style for a conjunction is and versus &. In addition to the typeconjunction, you could also use disjunction which will do an or instead of an and. I'm not sure what you'd use the unit type for.

You could use another locale, such as French, as well:

> const formatter = new Intl.ListFormat('fr', { style: 'long', type: 'conjunction' });
undefined

> formatter.format(['café', 'thé'])
'café et thé'

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