join
Joins a list of strings into a single string using a separator.
join(xs:list, [separator:string]) -> stringDescription
The join function concatenates the elements of the input list xs into a
single string, separated by the specified separator.
xs: list
A list of strings to join.
separator: string (optional)
The string used to separate elements in the result.
Defaults to "".
Examples
Join a list of strings with a comma
from {x: join(["a", "b", "c"], "-")}{x: "a-b-c"}