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Merged
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Mar 24, 2015
Merged

Add extend #20

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8 changes: 8 additions & 0 deletions README.md
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Expand Up @@ -269,6 +269,14 @@ Forwards co-Kleisli composition.

Backwards co-Kleisli composition.

#### `extend`

``` purescript
extend :: forall b a w. (Extend w) => (w a -> b) -> w a -> w b
```

An alias for `(<<=)`.

#### `duplicate`

``` purescript
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4 changes: 4 additions & 0 deletions src/Control/Extend.purs
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Expand Up @@ -35,6 +35,10 @@ instance extendArr :: (Semigroup w) => Extend ((->) w) where
(=<=) :: forall b a w c. (Extend w) => (w b -> c) -> (w a -> b) -> w a -> c
(=<=) f g w = f (g <<= w)

-- | An alias for `(<<=)`.
extend :: forall b a w. (Extend w) => (w a -> b) -> w a -> w b
extend = (<<=)

-- | Duplicate a comonadic context.
-- |
-- | `duplicate` is dual to `Control.Bind.join`.
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