urlJoin 
Merges the given string argument with the first argument (the beginning of the URL), joining it so that the slash (/) symbol is correctly included.
In Dart, accepts only one argument, organized as an List.
Parameters
args::...any[](JavaScript)args::List<dynamic>(Dart)
Returns
string
Examples
javascript
urlJoin('https://example.com', 'hello', 'world'); // Returns 'https://example.com/hello/world'dart
urlJoin(['https://example.com', 'hello', 'world']); // Returns 'https://example.com/hello/world'