mapValuesString

Returns a new map with all values transformed by the function. Keys are preserved.

Example:

    var map = new HashMap<string, string> (GLib.str_hash, GLib.str_equal);
    map.put ("name", "alice");
    var upper = Maps.mapValuesString (map, (v) => { return v.up (); });
    // upper["name"] == "ALICE"

Parameters:

map	the source map.
fn	the value transformation function.

Returns:

a new HashMap with transformed values.