为什么方法transform(在就地突变版本map)和retain(就地突变版本filter)是只定义mutable.Map,但不mutable.Buffer和mutable.Set?所有可变集合都不支持这些方法吗?
transform
map
retain
filter
mutable.Map
mutable.Buffer
mutable.Set
scala scala-2.8 scala-collections
scala ×1
scala-2.8 ×1
scala-collections ×1