:title
Call a function for each string

:sig
function each(items : dval, callback : function(value : string) string)

:returns
This function returns no value.

:content
`each` calls `callback` once for each item in a list-shaped `dval`.

The callback receives a string value. `each` processes items in list order.

:example capy render
var items := split("one,two", ",")
each(items, function(value : string) string { print(value); return "" })
print("\n")

:see-group
collections
