/**
* Returns the length of the {@code String} representation
* of this {@code StringJoiner}. Note that if
* no add methods have been called, then the length of the {@code String}
* representation (either {@code prefix + suffix} or {@code emptyValue})
* will be returned. The value should be equivalent to
* {@code toString().length()}.
*
* @return int
* the length of the current value of {@code StringJoiner}
*/
public function length()
{
// Remember that we never actually append the suffix unless we return
// the full (present) value or some sub-string or length of it, so that
// we can add on more if we need to.
return $this->value !== null ? $this->value->length() + $this->suffix->length() : $this->emptyValue->length();
}
public function testSetCharAt()
{
$sb = new StringBuilder();
$sb->append('This');
$sb->setCharAt(2, 'u');
$this->assertEquals('Thus', (string) $sb);
}
