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Add flatmap to maybe #800

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Add flatmap to maybe #800

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5 changes: 5 additions & 0 deletions lib/std/core/maybe.kk
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,11 @@ pub fun map( m : maybe<a>, f : a -> e b ) : e maybe<b>
Nothing -> Nothing
Just(x) -> Just(f(x))

pub fun flatmap( m : maybe<a>, f : a -> e maybe<b> ) : e maybe<b>
match m
Nothing -> Nothing
Just(x) -> f(x)

pub fun (||)( m1 : maybe<a>, m2: maybe<a> ) : maybe<a>
match m1
Nothing -> m2
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5 changes: 5 additions & 0 deletions lib/std/core/maybe2.kk
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,11 @@ pub fun map( m : maybe2<a,b>, f : (a,b) -> e (c,d) ) : e maybe2<c,d>
Just2(x,y) -> match f(x,y)
(fx,fy) -> Just2(fx,fy)

pub fun flatmap( m : maybe2<a,b>, f : (a,b) -> e maybe2<c,d> ) : e maybe2<c,d>
match m
Nothing2 -> Nothing2
Just2(x,y) -> f(x,y)

pub fun (||)( m1 : maybe2<a,b>, m2: maybe2<a,b> ) : maybe2<a,b>
match m1
Nothing2 -> m2
Expand Down