join method
override
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.
Implementation
String join([String separator = ""]) {
Iterator<E> iterator = this.iterator;
if (!iterator.moveNext()) return "";
StringBuffer buffer = new StringBuffer();
if (separator == null || separator == "") {
do {
buffer.write("${iterator.current}");
} while (iterator.moveNext());
} else {
buffer.write("${iterator.current}");
while (iterator.moveNext()) {
buffer.write(separator);
buffer.write("${iterator.current}");
}
}
return buffer.toString();
}