join method

String join([String separator = "" ])

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.

Source

String join([String separator = ""]) => readClasses().join(separator);

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https://api.dartlang.org/stable/1.24.3/dart-svg/AttributeClassSet/join.html