The factory companion object that builds instances of class $Coll. (or its Iterable superclass where class $Coll is not a Seq.)

Selects the first element of this collection.

Tests whether this collection is empty.

A sequential collection containing the same elements as this collection

Converts this collection of traversable collections into a collection formed by the elements of these traversable collections.

The resulting collection's type will be guided by the static type of collection. For example:

val xs = List(
           Set(1, 2, 3),
           Set(1, 2, 3)
         ).flatten
// xs == List(1, 2, 3, 1, 2, 3)

val ys = Set(
           List(1, 2, 3),
           List(3, 2, 1)
         ).flatten
// ys == Set(1, 2, 3)

The generic builder that builds instances of $Coll at arbitrary element types.

The builder that builds instances of type $Coll[A]

Transposes this collection of traversable collections into a collection of collections.

The resulting collection's type will be guided by the static type of collection. For example:

val xs = List(
           Set(1, 2, 3),
           Set(4, 5, 6)).transpose
// xs == List(
//         List(1, 4),
//         List(2, 5),
//         List(3, 6))

val ys = Vector(
           List(1, 2, 3),
           List(4, 5, 6)).transpose
// ys == Vector(
//         Vector(1, 4),
//         Vector(2, 5),
//         Vector(3, 6))

Converts this collection of pairs into two collections of the first and second half of each pair.

val xs = $Coll(
           (1, "one"),
           (2, "two"),
           (3, "three")).unzip
// xs == ($Coll(1, 2, 3),
//        $Coll(one, two, three))

Converts this collection of triples into three collections of the first, second, and third element of each triple.

val xs = $Coll(
           (1, "one", '1'),
           (2, "two", '2'),
           (3, "three", '3')).unzip3
// xs == ($Coll(1, 2, 3),
//        $Coll(one, two, three),
//        $Coll(1, 2, 3))