Converts each element to a String and concatenates the strings.
Iterates through elements of this iterable, converts each one to a String by calling Object.toString, and then concatenates the strings, with the separator
string interleaved between the elements.
String join([String separator = ""]) { if (length == 0) return ""; StringBuffer buffer = StringBuffer()..writeAll(this, separator); return buffer.toString(); }
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https://api.dart.dev/stable/2.5.0/dart-collection/ListMixin/join.html