cycle

cycle ties a finite list into a circular one, or equivalently, the infinite repetition of the original list. It is the identity on infinite lists.

Examples

>>> cycle []
*** Exception: Prelude.cycle: empty list

>>> take 10 (cycle [42])
[42,42,42,42,42,42,42,42,42,42]

>>> take 10 (cycle [2, 5, 7])
[2,5,7,2,5,7,2,5,7,2]

>>> take 1 (cycle (42 : undefined))
[42]

cycle xs returns the infinite repetition of xs:

cycle (1 :| [2,3]) = 1 :| [2,3,1,2,3,...]

cycle ties a finite ByteString into a circular one, or equivalently, the infinite repetition of the original ByteString.

cycle ties a finite, non-empty Text into a circular one, or equivalently, the infinite repetition of the original Text.

cycle ties a finite list into a circular one, or equivalently, the infinite repetition of the original list. It is the identity on infinite lists.

>>> cycle []
*** Exception: Prelude.cycle: empty list

>>> cycle [42]
[42,42,42,42,42,42,42,42,42,42...

>>> cycle [2, 5, 7]
[2,5,7,2,5,7,2,5,7,2,5,7...

Generalization of cycle to any monoid.

cycle ties a finite list into a circular one, or equivalently, the infinite repetition of the original list. It is the identity on infinite lists.

>>> cycle []
*** Exception: Prelude.cycle: empty list

>>> take 10 (cycle [42])
[42,42,42,42,42,42,42,42,42,42]

>>> take 10 (cycle [2, 5, 7])
[2,5,7,2,5,7,2,5,7,2]

>>> take 1 (cycle (42 : undefined))
[42]

Creates an infinite list from a finite list by appending the list to itself infinite times (i.e. by cycling the list). Unlike cycle from Data.List, this implementation doesn't throw error on empty lists, but returns an empty list instead.

>>> cycle []
[]

>>> take 10 $ cycle [1,2,3]
[1,2,3,1,2,3,1,2,3,1]

Cycle repeatedly through the layers of a stream, ad inf. This function is functor-general

cycle = forever

>>> rest <- S.print $ S.splitAt 3 $ S.cycle (yield True >> yield False)
True
False
True

>>> S.print $ S.take 3 rest
False
True
False

cycle ties a finite ByteString into a circular one, or equivalently, the infinite repetition of the original ByteString.

cycle ties a finite list into a circular one, or equivalently, the infinite repetition of the original list. It is the identity on infinite lists.

cycle ties a finite, non-empty Text into a circular one, or equivalently, the infinite repetition of the original Text.

cycle ties a finite list into a circular one, or equivalently, the infinite repetition of the original list. It is the identity on infinite lists.

>>> cycle []
*** Exception: Prelude.cycle: empty list

>>> take 20 $ cycle [42]
[42,42,42,42,42,42,42,42,42,42...

>>> take 20 $ cycle [2, 5, 7]
[2,5,7,2,5,7,2,5,7,2,5,7...

generic variants: cycle or better Semigroup.cycle

cycle ties a finite ByteStream into a circular one, or equivalently, the infinite repetition of the original ByteStream. For an empty bytestring (like return 17) it of course makes an unproductive loop

>>> Q.putStrLn $ Q.take 7 $ Q.cycle  "y\n"
y
y
y
y

Converts a finite list into a circular one

Uses sharing.

cycle xs returns the infinite repetition of xs:

cycle [1,2,3] = Cons 1 (Cons 2 (Cons 3 (Cons 1 (Cons 2 ...