join function

String join(
  1. List list, [
  2. String separator = ''
])

Returns the joined elements of the list if the list is not null; otherwise null.

Example: print(join(null)); => null

print(join([1, 2]));
=> 12

Implementation

String join(List list, [String separator = '']) {
  // if (list == null) {
  //   return null;
  // }

  return list.join(separator);
}