scala3-compiler-bootstrapped/dotty.tools.dotc.core/Decorators/ListDecorator

ListDecorator

final class ListDecorator[T](val xs: List[T]) extends AnyVal

Implements filterConserve, zipWithConserve methods on lists that avoid duplication of list nodes where feasible.

class AnyVal
trait Matchable
class Any

Value members

Concrete methods

def &(ys: List[T]): List[T]

Intersection on lists seen as sets

Intersection on lists seen as sets

final def eqElements(ys: List[AnyRef]): Boolean
def filterConserve(p: T => Boolean): List[T]

Like xs filter p but returns list xs itself - instead of a copy - if p is true for all elements.

Like xs filter p but returns list xs itself - instead of a copy - if p is true for all elements.

final def hasSameLengthAs[U](ys: List[U]): Boolean
def mapWithIndexConserve[U <: T](f: (T, Int) => U): List[U]

Like xs.lazyZip(xs.indices).map(f), but returns list xs itself

Like xs.lazyZip(xs.indices).map(f), but returns list xs itself

  • instead of a copy - if function f maps all elements of xs to themselves.
final def mapconserve[U](f: T => U): List[U]
def zipWithConserve[U](ys: List[U])(f: (T, U) => T): List[T]

Like xs.lazyZip(ys).map(f), but returns list xs itself

Like xs.lazyZip(ys).map(f), but returns list xs itself

  • instead of a copy - if function f maps all elements of xs to themselves. Also, it is required that ys is at least as long as xs.
def |(ys: List[T]): List[T]

Union on lists seen as sets

Union on lists seen as sets

Concrete fields

val xs: List[T]